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Simplifying 12(7) + 3(7 + -7) = x Multiply 12 * 7 84 + 3(7 + -7) = x Combine like terms: 7 + -7 = 0 84 + 3(0) = x Multiply 3 * 0 84 + 0 = x Anything times zero is zero. 84 + 0 = x Combine like terms: 84 + 0 = 84 84 = x Solving 84 = 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. 84 + -1x = x + -1x Combine like terms: x + -1x = 0 84 + -1x = 0 Add '-84' to each side of the equation. 84 + -84 + -1x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -1x = 0 + -84 -1x = 0 + -84 Combine like terms: 0 + -84 = -84 -1x = -84 Divide each side by '-1'. x = 84 Simplifying x = 84
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