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Simplifying 12x + -12 + x = 90 Reorder the terms: -12 + 12x + x = 90 Combine like terms: 12x + x = 13x -12 + 13x = 90 Solving -12 + 13x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 13x = 90 + 12 Combine like terms: -12 + 12 = 0 0 + 13x = 90 + 12 13x = 90 + 12 Combine like terms: 90 + 12 = 102 13x = 102 Divide each side by '13'. x = 7.846153846 Simplifying x = 7.846153846
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