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Simplifying 12x + -1(9x + -7) = 13 Reorder the terms: 12x + -1(-7 + 9x) = 13 12x + (-7 * -1 + 9x * -1) = 13 12x + (7 + -9x) = 13 Reorder the terms: 7 + 12x + -9x = 13 Combine like terms: 12x + -9x = 3x 7 + 3x = 13 Solving 7 + 3x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3x = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 13 + -7 3x = 13 + -7 Combine like terms: 13 + -7 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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