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Simplifying 5x + 10 + -7x = 21 Reorder the terms: 10 + 5x + -7x = 21 Combine like terms: 5x + -7x = -2x 10 + -2x = 21 Solving 10 + -2x = 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 + -2x = 21 + -10 Combine like terms: 10 + -10 = 0 0 + -2x = 21 + -10 -2x = 21 + -10 Combine like terms: 21 + -10 = 11 -2x = 11 Divide each side by '-2'. x = -5.5 Simplifying x = -5.5
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