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Simplifying 2x + -3 + 3x + -12 = 90 Reorder the terms: -3 + -12 + 2x + 3x = 90 Combine like terms: -3 + -12 = -15 -15 + 2x + 3x = 90 Combine like terms: 2x + 3x = 5x -15 + 5x = 90 Solving -15 + 5x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5x = 90 + 15 Combine like terms: -15 + 15 = 0 0 + 5x = 90 + 15 5x = 90 + 15 Combine like terms: 90 + 15 = 105 5x = 105 Divide each side by '5'. x = 21 Simplifying x = 21
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