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Simplifying x + -4(x + 12) = 21 Reorder the terms: x + -4(12 + x) = 21 x + (12 * -4 + x * -4) = 21 x + (-48 + -4x) = 21 Reorder the terms: -48 + x + -4x = 21 Combine like terms: x + -4x = -3x -48 + -3x = 21 Solving -48 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '48' to each side of the equation. -48 + 48 + -3x = 21 + 48 Combine like terms: -48 + 48 = 0 0 + -3x = 21 + 48 -3x = 21 + 48 Combine like terms: 21 + 48 = 69 -3x = 69 Divide each side by '-3'. x = -23 Simplifying x = -23
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