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Simplifying 80 = x + 2x + 7x Combine like terms: x + 2x = 3x 80 = 3x + 7x Combine like terms: 3x + 7x = 10x 80 = 10x Solving 80 = 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 80 + -10x = 10x + -10x Combine like terms: 10x + -10x = 0 80 + -10x = 0 Add '-80' to each side of the equation. 80 + -80 + -10x = 0 + -80 Combine like terms: 80 + -80 = 0 0 + -10x = 0 + -80 -10x = 0 + -80 Combine like terms: 0 + -80 = -80 -10x = -80 Divide each side by '-10'. x = 8 Simplifying x = 8
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