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Simplifying 2x + 13 = -77 + -7x Reorder the terms: 13 + 2x = -77 + -7x Solving 13 + 2x = -77 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 13 + 2x + 7x = -77 + -7x + 7x Combine like terms: 2x + 7x = 9x 13 + 9x = -77 + -7x + 7x Combine like terms: -7x + 7x = 0 13 + 9x = -77 + 0 13 + 9x = -77 Add '-13' to each side of the equation. 13 + -13 + 9x = -77 + -13 Combine like terms: 13 + -13 = 0 0 + 9x = -77 + -13 9x = -77 + -13 Combine like terms: -77 + -13 = -90 9x = -90 Divide each side by '9'. x = -10 Simplifying x = -10
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