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Simplifying -3x + 7 + -4x = -77 Reorder the terms: 7 + -3x + -4x = -77 Combine like terms: -3x + -4x = -7x 7 + -7x = -77 Solving 7 + -7x = -77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -7x = -77 + -7 Combine like terms: 7 + -7 = 0 0 + -7x = -77 + -7 -7x = -77 + -7 Combine like terms: -77 + -7 = -84 -7x = -84 Divide each side by '-7'. x = 12 Simplifying x = 12
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