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Simplifying 4x + 15 = x + 20 Reorder the terms: 15 + 4x = x + 20 Reorder the terms: 15 + 4x = 20 + x Solving 15 + 4x = 20 + 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. 15 + 4x + -1x = 20 + x + -1x Combine like terms: 4x + -1x = 3x 15 + 3x = 20 + x + -1x Combine like terms: x + -1x = 0 15 + 3x = 20 + 0 15 + 3x = 20 Add '-15' to each side of the equation. 15 + -15 + 3x = 20 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 20 + -15 3x = 20 + -15 Combine like terms: 20 + -15 = 5 3x = 5 Divide each side by '3'. x = 1.666666667 Simplifying x = 1.666666667
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