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Simplifying 2 + -7x + 8 + -4x = 21 Reorder the terms: 2 + 8 + -7x + -4x = 21 Combine like terms: 2 + 8 = 10 10 + -7x + -4x = 21 Combine like terms: -7x + -4x = -11x 10 + -11x = 21 Solving 10 + -11x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -11x = 21 + -10 Combine like terms: 10 + -10 = 0 0 + -11x = 21 + -10 -11x = 21 + -10 Combine like terms: 21 + -10 = 11 -11x = 11 Divide each side by '-11'. x = -1 Simplifying x = -1
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