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Simplifying 7x + -4(x + -2) = 129 Reorder the terms: 7x + -4(-2 + x) = 129 7x + (-2 * -4 + x * -4) = 129 7x + (8 + -4x) = 129 Reorder the terms: 8 + 7x + -4x = 129 Combine like terms: 7x + -4x = 3x 8 + 3x = 129 Solving 8 + 3x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 3x = 129 + -8 Combine like terms: 8 + -8 = 0 0 + 3x = 129 + -8 3x = 129 + -8 Combine like terms: 129 + -8 = 121 3x = 121 Divide each side by '3'. x = 40.33333333 Simplifying x = 40.33333333
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