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Simplifying -21 + -7x = -126 Solving -21 + -7x = -126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -7x = -126 + 21 Combine like terms: -21 + 21 = 0 0 + -7x = -126 + 21 -7x = -126 + 21 Combine like terms: -126 + 21 = -105 -7x = -105 Divide each side by '-7'. x = 15 Simplifying x = 15
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