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Simplifying 15 + -1(-15) = x Multiply -1 * -15 15 + 15 = x Combine like terms: 15 + 15 = 30 30 = x Solving 30 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 30 + -1x = x + -1x Combine like terms: x + -1x = 0 30 + -1x = 0 Add '-30' to each side of the equation. 30 + -30 + -1x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -1x = 0 + -30 -1x = 0 + -30 Combine like terms: 0 + -30 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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