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Simplifying -100 + -21x = -520 Solving -100 + -21x = -520 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + -21x = -520 + 100 Combine like terms: -100 + 100 = 0 0 + -21x = -520 + 100 -21x = -520 + 100 Combine like terms: -520 + 100 = -420 -21x = -420 Divide each side by '-21'. x = 20 Simplifying x = 20
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