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Simplifying 20 + x = 4x + -7 Reorder the terms: 20 + x = -7 + 4x Solving 20 + x = -7 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 20 + x + -4x = -7 + 4x + -4x Combine like terms: x + -4x = -3x 20 + -3x = -7 + 4x + -4x Combine like terms: 4x + -4x = 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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