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Simplifying 45 = x + (x + -15) Reorder the terms: 45 = x + (-15 + x) Remove parenthesis around (-15 + x) 45 = x + -15 + x Reorder the terms: 45 = -15 + x + x Combine like terms: x + x = 2x 45 = -15 + 2x Solving 45 = -15 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 45 + -2x = -15 + 2x + -2x Combine like terms: 2x + -2x = 0 45 + -2x = -15 + 0 45 + -2x = -15 Add '-45' to each side of the equation. 45 + -45 + -2x = -15 + -45 Combine like terms: 45 + -45 = 0 0 + -2x = -15 + -45 -2x = -15 + -45 Combine like terms: -15 + -45 = -60 -2x = -60 Divide each side by '-2'. x = 30 Simplifying x = 30
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