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Simplifying 9 + -3(2x + -7) = 42 Reorder the terms: 9 + -3(-7 + 2x) = 42 9 + (-7 * -3 + 2x * -3) = 42 9 + (21 + -6x) = 42 Combine like terms: 9 + 21 = 30 30 + -6x = 42 Solving 30 + -6x = 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 + -6x = 42 + -30 Combine like terms: 30 + -30 = 0 0 + -6x = 42 + -30 -6x = 42 + -30 Combine like terms: 42 + -30 = 12 -6x = 12 Divide each side by '-6'. x = -2 Simplifying x = -2
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