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Simplifying 78 = (15 + 2x) + x Remove parenthesis around (15 + 2x) 78 = 15 + 2x + x Combine like terms: 2x + x = 3x 78 = 15 + 3x Solving 78 = 15 + 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. 78 + -3x = 15 + 3x + -3x Combine like terms: 3x + -3x = 0 78 + -3x = 15 + 0 78 + -3x = 15 Add '-78' to each side of the equation. 78 + -78 + -3x = 15 + -78 Combine like terms: 78 + -78 = 0 0 + -3x = 15 + -78 -3x = 15 + -78 Combine like terms: 15 + -78 = -63 -3x = -63 Divide each side by '-3'. x = 21 Simplifying x = 21
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