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Simplifying 80 + 9x = 7x Solving 80 + 9x = 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. 80 + 9x + -7x = 7x + -7x Combine like terms: 9x + -7x = 2x 80 + 2x = 7x + -7x Combine like terms: 7x + -7x = 0 80 + 2x = 0 Add '-80' to each side of the equation. 80 + -80 + 2x = 0 + -80 Combine like terms: 80 + -80 = 0 0 + 2x = 0 + -80 2x = 0 + -80 Combine like terms: 0 + -80 = -80 2x = -80 Divide each side by '2'. x = -40 Simplifying x = -40
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