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Simplifying 90 + 9x = 80 + 12x Solving 90 + 9x = 80 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 90 + 9x + -12x = 80 + 12x + -12x Combine like terms: 9x + -12x = -3x 90 + -3x = 80 + 12x + -12x Combine like terms: 12x + -12x = 0 90 + -3x = 80 + 0 90 + -3x = 80 Add '-90' to each side of the equation. 90 + -90 + -3x = 80 + -90 Combine like terms: 90 + -90 = 0 0 + -3x = 80 + -90 -3x = 80 + -90 Combine like terms: 80 + -90 = -10 -3x = -10 Divide each side by '-3'. x = 3.333333333 Simplifying x = 3.333333333
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