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Simplifying 80 + x = 3(7 + x) 80 + x = (7 * 3 + x * 3) 80 + x = (21 + 3x) Solving 80 + x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 80 + x + -3x = 21 + 3x + -3x Combine like terms: x + -3x = -2x 80 + -2x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 80 + -2x = 21 + 0 80 + -2x = 21 Add '-80' to each side of the equation. 80 + -80 + -2x = 21 + -80 Combine like terms: 80 + -80 = 0 0 + -2x = 21 + -80 -2x = 21 + -80 Combine like terms: 21 + -80 = -59 -2x = -59 Divide each side by '-2'. x = 29.5 Simplifying x = 29.5
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