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Simplifying (7x + 8) + -1(3x + 12) = 0 Reorder the terms: (8 + 7x) + -1(3x + 12) = 0 Remove parenthesis around (8 + 7x) 8 + 7x + -1(3x + 12) = 0 Reorder the terms: 8 + 7x + -1(12 + 3x) = 0 8 + 7x + (12 * -1 + 3x * -1) = 0 8 + 7x + (-12 + -3x) = 0 Reorder the terms: 8 + -12 + 7x + -3x = 0 Combine like terms: 8 + -12 = -4 -4 + 7x + -3x = 0 Combine like terms: 7x + -3x = 4x -4 + 4x = 0 Solving -4 + 4x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 4x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 4x = 0 + 4 4x = 0 + 4 Combine like terms: 0 + 4 = 4 4x = 4 Divide each side by '4'. x = 1 Simplifying x = 1
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