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Simplifying 12 + -1(-7x) + 4 + -1(-12) = 0 Remove parenthesis around (-7x) 12 + -1 * -7x + 4 + -1(-12) = 0 Multiply -1 * -7 12 + 7x + 4 + -1(-12) = 0 Multiply -1 * -12 12 + 7x + 4 + 12 = 0 Reorder the terms: 12 + 4 + 12 + 7x = 0 Combine like terms: 12 + 4 = 16 16 + 12 + 7x = 0 Combine like terms: 16 + 12 = 28 28 + 7x = 0 Solving 28 + 7x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 7x = 0 + -28 Combine like terms: 28 + -28 = 0 0 + 7x = 0 + -28 7x = 0 + -28 Combine like terms: 0 + -28 = -28 7x = -28 Divide each side by '7'. x = -4 Simplifying x = -4
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