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Simplifying 90x + 70 = 80x + 120 Reorder the terms: 70 + 90x = 80x + 120 Reorder the terms: 70 + 90x = 120 + 80x Solving 70 + 90x = 120 + 80x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-80x' to each side of the equation. 70 + 90x + -80x = 120 + 80x + -80x Combine like terms: 90x + -80x = 10x 70 + 10x = 120 + 80x + -80x Combine like terms: 80x + -80x = 0 70 + 10x = 120 + 0 70 + 10x = 120 Add '-70' to each side of the equation. 70 + -70 + 10x = 120 + -70 Combine like terms: 70 + -70 = 0 0 + 10x = 120 + -70 10x = 120 + -70 Combine like terms: 120 + -70 = 50 10x = 50 Divide each side by '10'. x = 5 Simplifying x = 5
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