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Simplifying -5x + -4(x + 3) = -21 Reorder the terms: -5x + -4(3 + x) = -21 -5x + (3 * -4 + x * -4) = -21 -5x + (-12 + -4x) = -21 Reorder the terms: -12 + -5x + -4x = -21 Combine like terms: -5x + -4x = -9x -12 + -9x = -21 Solving -12 + -9x = -21 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 + -9x = -21 + 12 Combine like terms: -12 + 12 = 0 0 + -9x = -21 + 12 -9x = -21 + 12 Combine like terms: -21 + 12 = -9 -9x = -9 Divide each side by '-9'. x = 1 Simplifying x = 1
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