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Simplifying 87 + -1(3x + 11) = 3(x + 9) + x Reorder the terms: 87 + -1(11 + 3x) = 3(x + 9) + x 87 + (11 * -1 + 3x * -1) = 3(x + 9) + x 87 + (-11 + -3x) = 3(x + 9) + x Combine like terms: 87 + -11 = 76 76 + -3x = 3(x + 9) + x Reorder the terms: 76 + -3x = 3(9 + x) + x 76 + -3x = (9 * 3 + x * 3) + x 76 + -3x = (27 + 3x) + x Combine like terms: 3x + x = 4x 76 + -3x = 27 + 4x Solving 76 + -3x = 27 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 76 + -3x + -4x = 27 + 4x + -4x Combine like terms: -3x + -4x = -7x 76 + -7x = 27 + 4x + -4x Combine like terms: 4x + -4x = 0 76 + -7x = 27 + 0 76 + -7x = 27 Add '-76' to each side of the equation. 76 + -76 + -7x = 27 + -76 Combine like terms: 76 + -76 = 0 0 + -7x = 27 + -76 -7x = 27 + -76 Combine like terms: 27 + -76 = -49 -7x = -49 Divide each side by '-7'. x = 7 Simplifying x = 7
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