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Simplifying 7x + 13(10x + -12) = 255 Reorder the terms: 7x + 13(-12 + 10x) = 255 7x + (-12 * 13 + 10x * 13) = 255 7x + (-156 + 130x) = 255 Reorder the terms: -156 + 7x + 130x = 255 Combine like terms: 7x + 130x = 137x -156 + 137x = 255 Solving -156 + 137x = 255 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '156' to each side of the equation. -156 + 156 + 137x = 255 + 156 Combine like terms: -156 + 156 = 0 0 + 137x = 255 + 156 137x = 255 + 156 Combine like terms: 255 + 156 = 411 137x = 411 Divide each side by '137'. x = 3 Simplifying x = 3
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