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Simplifying x + 6x + -7 = -77 Reorder the terms: -7 + x + 6x = -77 Combine like terms: x + 6x = 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 = -70 7x = -70 Divide each side by '7'. x = -10 Simplifying x = -10
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