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Simplifying 3x + 20 = 7x Reorder the terms: 20 + 3x = 7x Solving 20 + 3x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 20 + 3x + -7x = 7x + -7x Combine like terms: 3x + -7x = -4x 20 + -4x = 7x + -7x Combine like terms: 7x + -7x = 0 20 + -4x = 0 Add '-20' to each side of the equation. 20 + -20 + -4x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -4x = 0 + -20 -4x = 0 + -20 Combine like terms: 0 + -20 = -20 -4x = -20 Divide each side by '-4'. x = 5 Simplifying x = 5
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