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Simplifying 7(2x + -6) + 12 = 138 Reorder the terms: 7(-6 + 2x) + 12 = 138 (-6 * 7 + 2x * 7) + 12 = 138 (-42 + 14x) + 12 = 138 Reorder the terms: -42 + 12 + 14x = 138 Combine like terms: -42 + 12 = -30 -30 + 14x = 138 Solving -30 + 14x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 14x = 138 + 30 Combine like terms: -30 + 30 = 0 0 + 14x = 138 + 30 14x = 138 + 30 Combine like terms: 138 + 30 = 168 14x = 168 Divide each side by '14'. x = 12 Simplifying x = 12
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