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Simplifying -20 + 4x = 7 + x Solving -20 + 4x = 7 + 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. -20 + 4x + -1x = 7 + x + -1x Combine like terms: 4x + -1x = 3x -20 + 3x = 7 + x + -1x Combine like terms: x + -1x = 0 -20 + 3x = 7 + 0 -20 + 3x = 7 Add '20' to each side of the equation. -20 + 20 + 3x = 7 + 20 Combine like terms: -20 + 20 = 0 0 + 3x = 7 + 20 3x = 7 + 20 Combine like terms: 7 + 20 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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