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Simplifying 3x + 17 + 15x + -21 = 90 Reorder the terms: 17 + -21 + 3x + 15x = 90 Combine like terms: 17 + -21 = -4 -4 + 3x + 15x = 90 Combine like terms: 3x + 15x = 18x -4 + 18x = 90 Solving -4 + 18x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 18x = 90 + 4 Combine like terms: -4 + 4 = 0 0 + 18x = 90 + 4 18x = 90 + 4 Combine like terms: 90 + 4 = 94 18x = 94 Divide each side by '18'. x = 5.222222222 Simplifying x = 5.222222222
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