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Simplifying 90 + -5x = 7x + -18 Reorder the terms: 90 + -5x = -18 + 7x Solving 90 + -5x = -18 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 90 + -5x + -7x = -18 + 7x + -7x Combine like terms: -5x + -7x = -12x 90 + -12x = -18 + 7x + -7x Combine like terms: 7x + -7x = 0 90 + -12x = -18 + 0 90 + -12x = -18 Add '-90' to each side of the equation. 90 + -90 + -12x = -18 + -90 Combine like terms: 90 + -90 = 0 0 + -12x = -18 + -90 -12x = -18 + -90 Combine like terms: -18 + -90 = -108 -12x = -108 Divide each side by '-12'. x = 9 Simplifying x = 9
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