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Simplifying 9(x + -7) = 3(x + 3) Reorder the terms: 9(-7 + x) = 3(x + 3) (-7 * 9 + x * 9) = 3(x + 3) (-63 + 9x) = 3(x + 3) Reorder the terms: -63 + 9x = 3(3 + x) -63 + 9x = (3 * 3 + x * 3) -63 + 9x = (9 + 3x) Solving -63 + 9x = 9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -63 + 9x + -3x = 9 + 3x + -3x Combine like terms: 9x + -3x = 6x -63 + 6x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 -63 + 6x = 9 + 0 -63 + 6x = 9 Add '63' to each side of the equation. -63 + 63 + 6x = 9 + 63 Combine like terms: -63 + 63 = 0 0 + 6x = 9 + 63 6x = 9 + 63 Combine like terms: 9 + 63 = 72 6x = 72 Divide each side by '6'. x = 12 Simplifying x = 12
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