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Simplifying 90 + 0.80x = 20 + 0.90x Solving 90 + 0.80x = 20 + 0.90x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.90x' to each side of the equation. 90 + 0.80x + -0.90x = 20 + 0.90x + -0.90x Combine like terms: 0.80x + -0.90x = -0.1x 90 + -0.1x = 20 + 0.90x + -0.90x Combine like terms: 0.90x + -0.90x = 0.00 90 + -0.1x = 20 + 0.00 90 + -0.1x = 20 Add '-90' to each side of the equation. 90 + -90 + -0.1x = 20 + -90 Combine like terms: 90 + -90 = 0 0 + -0.1x = 20 + -90 -0.1x = 20 + -90 Combine like terms: 20 + -90 = -70 -0.1x = -70 Divide each side by '-0.1'. x = 700 Simplifying x = 700
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