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Simplifying 3(x + -3) = 9(x + -7) Reorder the terms: 3(-3 + x) = 9(x + -7) (-3 * 3 + x * 3) = 9(x + -7) (-9 + 3x) = 9(x + -7) Reorder the terms: -9 + 3x = 9(-7 + x) -9 + 3x = (-7 * 9 + x * 9) -9 + 3x = (-63 + 9x) Solving -9 + 3x = -63 + 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. -9 + 3x + -9x = -63 + 9x + -9x Combine like terms: 3x + -9x = -6x -9 + -6x = -63 + 9x + -9x Combine like terms: 9x + -9x = 0 -9 + -6x = -63 + 0 -9 + -6x = -63 Add '9' to each side of the equation. -9 + 9 + -6x = -63 + 9 Combine like terms: -9 + 9 = 0 0 + -6x = -63 + 9 -6x = -63 + 9 Combine like terms: -63 + 9 = -54 -6x = -54 Divide each side by '-6'. x = 9 Simplifying x = 9
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