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Simplifying -21 = -4 + -1x Solving -21 = -4 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -21 + x = -4 + -1x + x Combine like terms: -1x + x = 0 -21 + x = -4 + 0 -21 + x = -4 Add '21' to each side of the equation. -21 + 21 + x = -4 + 21 Combine like terms: -21 + 21 = 0 0 + x = -4 + 21 x = -4 + 21 Combine like terms: -4 + 21 = 17 x = 17 Simplifying x = 17
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