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Simplifying 3x + -7(3x + -7) = -77 Reorder the terms: 3x + -7(-7 + 3x) = -77 3x + (-7 * -7 + 3x * -7) = -77 3x + (49 + -21x) = -77 Reorder the terms: 49 + 3x + -21x = -77 Combine like terms: 3x + -21x = -18x 49 + -18x = -77 Solving 49 + -18x = -77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -18x = -77 + -49 Combine like terms: 49 + -49 = 0 0 + -18x = -77 + -49 -18x = -77 + -49 Combine like terms: -77 + -49 = -126 -18x = -126 Divide each side by '-18'. x = 7 Simplifying x = 7
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