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Simplifying 18 = 3(2x + 7) + -3x Reorder the terms: 18 = 3(7 + 2x) + -3x 18 = (7 * 3 + 2x * 3) + -3x 18 = (21 + 6x) + -3x Combine like terms: 6x + -3x = 3x 18 = 21 + 3x Solving 18 = 21 + 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. 18 + -3x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 18 + -3x = 21 + 0 18 + -3x = 21 Add '-18' to each side of the equation. 18 + -18 + -3x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + -3x = 21 + -18 -3x = 21 + -18 Combine like terms: 21 + -18 = 3 -3x = 3 Divide each side by '-3'. x = -1 Simplifying x = -1
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