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Simplifying 23 + -1(x + -7) = 42 Reorder the terms: 23 + -1(-7 + x) = 42 23 + (-7 * -1 + x * -1) = 42 23 + (7 + -1x) = 42 Combine like terms: 23 + 7 = 30 30 + -1x = 42 Solving 30 + -1x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -1x = 42 + -30 Combine like terms: 30 + -30 = 0 0 + -1x = 42 + -30 -1x = 42 + -30 Combine like terms: 42 + -30 = 12 -1x = 12 Divide each side by '-1'. x = -12 Simplifying x = -12
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