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Simplifying -9 = 3(x + -7) + -1(2x + -3) Reorder the terms: -9 = 3(-7 + x) + -1(2x + -3) -9 = (-7 * 3 + x * 3) + -1(2x + -3) -9 = (-21 + 3x) + -1(2x + -3) Reorder the terms: -9 = -21 + 3x + -1(-3 + 2x) -9 = -21 + 3x + (-3 * -1 + 2x * -1) -9 = -21 + 3x + (3 + -2x) Reorder the terms: -9 = -21 + 3 + 3x + -2x Combine like terms: -21 + 3 = -18 -9 = -18 + 3x + -2x Combine like terms: 3x + -2x = 1x -9 = -18 + 1x Solving -9 = -18 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -9 + -1x = -18 + 1x + -1x Combine like terms: 1x + -1x = 0 -9 + -1x = -18 + 0 -9 + -1x = -18 Add '9' to each side of the equation. -9 + 9 + -1x = -18 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = -18 + 9 -1x = -18 + 9 Combine like terms: -18 + 9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9
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