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Simplifying 12 + 3(x + -4) + -21 = 0 Reorder the terms: 12 + 3(-4 + x) + -21 = 0 12 + (-4 * 3 + x * 3) + -21 = 0 12 + (-12 + 3x) + -21 = 0 Reorder the terms: 12 + -12 + -21 + 3x = 0 Combine like terms: 12 + -12 = 0 0 + -21 + 3x = 0 -21 + 3x = 0 Solving -21 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 0 + 21 3x = 0 + 21 Combine like terms: 0 + 21 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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