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Simplifying -7(3x + 10) = 77 Reorder the terms: -7(10 + 3x) = 77 (10 * -7 + 3x * -7) = 77 (-70 + -21x) = 77 Solving -70 + -21x = 77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '70' to each side of the equation. -70 + 70 + -21x = 77 + 70 Combine like terms: -70 + 70 = 0 0 + -21x = 77 + 70 -21x = 77 + 70 Combine like terms: 77 + 70 = 147 -21x = 147 Divide each side by '-21'. x = -7 Simplifying x = -7
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