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Simplifying 3x + -12 = -20 + 7x Reorder the terms: -12 + 3x = -20 + 7x Solving -12 + 3x = -20 + 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. -12 + 3x + -7x = -20 + 7x + -7x Combine like terms: 3x + -7x = -4x -12 + -4x = -20 + 7x + -7x Combine like terms: 7x + -7x = 0 -12 + -4x = -20 + 0 -12 + -4x = -20 Add '12' to each side of the equation. -12 + 12 + -4x = -20 + 12 Combine like terms: -12 + 12 = 0 0 + -4x = -20 + 12 -4x = -20 + 12 Combine like terms: -20 + 12 = -8 -4x = -8 Divide each side by '-4'. x = 2 Simplifying x = 2
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