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Simplifying 7(90 + -1x) = 5x (90 * 7 + -1x * 7) = 5x (630 + -7x) = 5x Solving 630 + -7x = 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 630 + -7x + -5x = 5x + -5x Combine like terms: -7x + -5x = -12x 630 + -12x = 5x + -5x Combine like terms: 5x + -5x = 0 630 + -12x = 0 Add '-630' to each side of the equation. 630 + -630 + -12x = 0 + -630 Combine like terms: 630 + -630 = 0 0 + -12x = 0 + -630 -12x = 0 + -630 Combine like terms: 0 + -630 = -630 -12x = -630 Divide each side by '-12'. x = 52.5 Simplifying x = 52.5
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