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Simplifying 15 + x = 3x + -3 Reorder the terms: 15 + x = -3 + 3x Solving 15 + x = -3 + 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. 15 + x + -3x = -3 + 3x + -3x Combine like terms: x + -3x = -2x 15 + -2x = -3 + 3x + -3x Combine like terms: 3x + -3x = 0 15 + -2x = -3 + 0 15 + -2x = -3 Add '-15' to each side of the equation. 15 + -15 + -2x = -3 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = -3 + -15 -2x = -3 + -15 Combine like terms: -3 + -15 = -18 -2x = -18 Divide each side by '-2'. x = 9 Simplifying x = 9
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