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