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Simplifying 2x + 7 + 8x + -20 = 90 Reorder the terms: 7 + -20 + 2x + 8x = 90 Combine like terms: 7 + -20 = -13 -13 + 2x + 8x = 90 Combine like terms: 2x + 8x = 10x -13 + 10x = 90 Solving -13 + 10x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 10x = 90 + 13 Combine like terms: -13 + 13 = 0 0 + 10x = 90 + 13 10x = 90 + 13 Combine like terms: 90 + 13 = 103 10x = 103 Divide each side by '10'. x = 10.3 Simplifying x = 10.3
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