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Simplifying 12 + -7x = 20 + x Solving 12 + -7x = 20 + 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. 12 + -7x + -1x = 20 + x + -1x Combine like terms: -7x + -1x = -8x 12 + -8x = 20 + x + -1x Combine like terms: x + -1x = 0 12 + -8x = 20 + 0 12 + -8x = 20 Add '-12' to each side of the equation. 12 + -12 + -8x = 20 + -12 Combine like terms: 12 + -12 = 0 0 + -8x = 20 + -12 -8x = 20 + -12 Combine like terms: 20 + -12 = 8 -8x = 8 Divide each side by '-8'. x = -1 Simplifying x = -1
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