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Simplifying -4(x + -2) + -21 = -13 Reorder the terms: -4(-2 + x) + -21 = -13 (-2 * -4 + x * -4) + -21 = -13 (8 + -4x) + -21 = -13 Reorder the terms: 8 + -21 + -4x = -13 Combine like terms: 8 + -21 = -13 -13 + -4x = -13 Add '13' to each side of the equation. -13 + 13 + -4x = -13 + 13 Combine like terms: -13 + 13 = 0 0 + -4x = -13 + 13 -4x = -13 + 13 Combine like terms: -13 + 13 = 0 -4x = 0 Solving -4x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-4'. x = 0 Simplifying x = 0
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