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Simplifying -77 = -7(4 + 3x) + -7 -77 = (4 * -7 + 3x * -7) + -7 -77 = (-28 + -21x) + -7 Reorder the terms: -77 = -28 + -7 + -21x Combine like terms: -28 + -7 = -35 -77 = -35 + -21x Solving -77 = -35 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -77 + 21x = -35 + -21x + 21x Combine like terms: -21x + 21x = 0 -77 + 21x = -35 + 0 -77 + 21x = -35 Add '77' to each side of the equation. -77 + 77 + 21x = -35 + 77 Combine like terms: -77 + 77 = 0 0 + 21x = -35 + 77 21x = -35 + 77 Combine like terms: -35 + 77 = 42 21x = 42 Divide each side by '21'. x = 2 Simplifying x = 2
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