1)15x + ( - 6x + 5) - 2 - ( - x + 3) = - (7x + 23) - x + (3 - 2x) 15x - 6x + 5 - 2 + x - 3 = - 7x - 23 - x + 3 - 2x 10x + 0 = - 10x - 20 10x + 10x = - 20 20x / 20 = - 20 / 20 x = - 1
2) - {3x + 8 - { - 15 + 6x - ( - 3x + 2) - (5x + 4)} - 29} = - 5 {3x + 8 - { - 15 + 6x + 3x - 2 - 5x - 4} - 29} = - 5 {3x + 8 + 15 - 6x - 3x + x + 5x + 4 - 29} = - 5 0x - 2 = - 5 0x = - 3 / 0 x = indeterminado
3) 9x - (5x + 1) - {2 + 8x - (7x - 5)} + 9x = 0 9x - 5x - 1 - {2 + 8x - 7x + 5} + 9x = 0 4x - 1 - 2 - 8x + 7x - 5 + 9x = 0 12x - 1 = 0 x = 0 + 1 / 12 x = 1 / 12
4)16x - {3x - (6 - 9x)} = 30x + { - (3x + 2) - (x + 3)} 16x - {3x - 6 + 9x} = 30x{ - 3x - 2 - x - 3} 16x - 3x + 6 - 9x = 30x - 3x - 2 - x - 3 4x + 6 = 26x - 5 6 + 5 = 26x - 4x 11 / 22 = 22x / 22 x = 1 / 11
5)5y + 6y - 81 = 7y + 102 + 65y 11y - 81 = 72y + 102 102 - 81 = 72y - 11y 21 / 61 = 61y / 61 y = 21 / 61
6)8x - 15x - 30x - 51x = 53x + 31x - 172 - 89x = 84x - 172 89x + 84x = 172 173x / 173 = 172 / 173 x = 172 / 173
7) 21 - 6x = 27 - 8x 8x - 6x = 27 - 21 2x / 2 = 6 / 2 x = 3
8) 15x - 10 = 6x - (x + 2) + ( - x + 3) 15x - 10 = 6x - x - 2 - x + 3 15x - 10 = 4x + 1 15x - 4x = 1 + 10 11x / 11 = 11 / 11 x = 1
9)3x - (2x - 1) = 7x - (3 - 5x) + ( - x + 24) 3x - 2x + 1 = 7x - 3 + 5x - x + 24 x + 1 = 11x + 21 1 - 21 = 11x - x - 20 / 10 = 10x / 10 x = - 2.