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Simplifying 3(x + -7) = 12 Reorder the terms: 3(-7 + x) = 12 (-7 * 3 + x * 3) = 12 (-21 + 3x) = 12 Solving -21 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 12 + 21 3x = 12 + 21 Combine like terms: 12 + 21 = 33 3x = 33 Divide each side by '3'. x = 11 Simplifying x = 11
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