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Simplifying -12 + 4x = 21 + x Solving -12 + 4x = 21 + 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 + 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x -12 + 3x = 21 + x + -1x Combine like terms: x + -1x = 0 -12 + 3x = 21 + 0 -12 + 3x = 21 Add '12' to each side of the equation. -12 + 12 + 3x = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 21 + 12 3x = 21 + 12 Combine like terms: 21 + 12 = 33 3x = 33 Divide each side by '3'. x = 11 Simplifying x = 11
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