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Simplifying 3x + -10 + 7x + 20 = 90 Reorder the terms: -10 + 20 + 3x + 7x = 90 Combine like terms: -10 + 20 = 10 10 + 3x + 7x = 90 Combine like terms: 3x + 7x = 10x 10 + 10x = 90 Solving 10 + 10x = 90 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 + 10x = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 10x = 90 + -10 10x = 90 + -10 Combine like terms: 90 + -10 = 80 10x = 80 Divide each side by '10'. x = 8 Simplifying x = 8
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