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Simplifying 40 + 80x = 90x Solving 40 + 80x = 90x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90x' to each side of the equation. 40 + 80x + -90x = 90x + -90x Combine like terms: 80x + -90x = -10x 40 + -10x = 90x + -90x Combine like terms: 90x + -90x = 0 40 + -10x = 0 Add '-40' to each side of the equation. 40 + -40 + -10x = 0 + -40 Combine like terms: 40 + -40 = 0 0 + -10x = 0 + -40 -10x = 0 + -40 Combine like terms: 0 + -40 = -40 -10x = -40 Divide each side by '-10'. x = 4 Simplifying x = 4
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