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Simplifying 3(20 + x) = 100 + x (20 * 3 + x * 3) = 100 + x (60 + 3x) = 100 + x Solving 60 + 3x = 100 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 60 + 3x + -1x = 100 + x + -1x Combine like terms: 3x + -1x = 2x 60 + 2x = 100 + x + -1x Combine like terms: x + -1x = 0 60 + 2x = 100 + 0 60 + 2x = 100 Add '-60' to each side of the equation. 60 + -60 + 2x = 100 + -60 Combine like terms: 60 + -60 = 0 0 + 2x = 100 + -60 2x = 100 + -60 Combine like terms: 100 + -60 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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