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Simplifying 4x + -129 = 40 + -9x Reorder the terms: -129 + 4x = 40 + -9x Solving -129 + 4x = 40 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -129 + 4x + 9x = 40 + -9x + 9x Combine like terms: 4x + 9x = 13x -129 + 13x = 40 + -9x + 9x Combine like terms: -9x + 9x = 0 -129 + 13x = 40 + 0 -129 + 13x = 40 Add '129' to each side of the equation. -129 + 129 + 13x = 40 + 129 Combine like terms: -129 + 129 = 0 0 + 13x = 40 + 129 13x = 40 + 129 Combine like terms: 40 + 129 = 169 13x = 169 Divide each side by '13'. x = 13 Simplifying x = 13
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