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Simplifying -3(10 + -7x) = 117 (10 * -3 + -7x * -3) = 117 (-30 + 21x) = 117 Solving -30 + 21x = 117 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 + 21x = 117 + 30 Combine like terms: -30 + 30 = 0 0 + 21x = 117 + 30 21x = 117 + 30 Combine like terms: 117 + 30 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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