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Simplifying 4 = 3x + 20 + -7x Reorder the terms: 4 = 20 + 3x + -7x Combine like terms: 3x + -7x = -4x 4 = 20 + -4x Solving 4 = 20 + -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. 4 + 4x = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 4 + 4x = 20 + 0 4 + 4x = 20 Add '-4' to each side of the equation. 4 + -4 + 4x = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 4x = 20 + -4 4x = 20 + -4 Combine like terms: 20 + -4 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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