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Simplifying 7x + -7(4x + -16) = -77 Reorder the terms: 7x + -7(-16 + 4x) = -77 7x + (-16 * -7 + 4x * -7) = -77 7x + (112 + -28x) = -77 Reorder the terms: 112 + 7x + -28x = -77 Combine like terms: 7x + -28x = -21x 112 + -21x = -77 Solving 112 + -21x = -77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-112' to each side of the equation. 112 + -112 + -21x = -77 + -112 Combine like terms: 112 + -112 = 0 0 + -21x = -77 + -112 -21x = -77 + -112 Combine like terms: -77 + -112 = -189 -21x = -189 Divide each side by '-21'. x = 9 Simplifying x = 9
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