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Simplifying 90 = 3x + 6x Combine like terms: 3x + 6x = 9x 90 = 9x Solving 90 = 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 90 + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 90 + -9x = 0 Add '-90' to each side of the equation. 90 + -90 + -9x = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -9x = 0 + -90 -9x = 0 + -90 Combine like terms: 0 + -90 = -90 -9x = -90 Divide each side by '-9'. x = 10 Simplifying x = 10
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