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Simplifying 75 = 21 + 3x Solving 75 = 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. 75 + -3x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 75 + -3x = 21 + 0 75 + -3x = 21 Add '-75' to each side of the equation. 75 + -75 + -3x = 21 + -75 Combine like terms: 75 + -75 = 0 0 + -3x = 21 + -75 -3x = 21 + -75 Combine like terms: 21 + -75 = -54 -3x = -54 Divide each side by '-3'. x = 18 Simplifying x = 18
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