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Simplifying x + 3(x + 3) = 7(x + -3) Reorder the terms: x + 3(3 + x) = 7(x + -3) x + (3 * 3 + x * 3) = 7(x + -3) x + (9 + 3x) = 7(x + -3) Reorder the terms: 9 + x + 3x = 7(x + -3) Combine like terms: x + 3x = 4x 9 + 4x = 7(x + -3) Reorder the terms: 9 + 4x = 7(-3 + x) 9 + 4x = (-3 * 7 + x * 7) 9 + 4x = (-21 + 7x) Solving 9 + 4x = -21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 9 + 4x + -7x = -21 + 7x + -7x Combine like terms: 4x + -7x = -3x 9 + -3x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 9 + -3x = -21 + 0 9 + -3x = -21 Add '-9' to each side of the equation. 9 + -9 + -3x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -3x = -21 + -9 -3x = -21 + -9 Combine like terms: -21 + -9 = -30 -3x = -30 Divide each side by '-3'. x = 10 Simplifying x = 10
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