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Simplifying 7x + -63 = 21 Reorder the terms: -63 + 7x = 21 Solving -63 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 7x = 21 + 63 Combine like terms: -63 + 63 = 0 0 + 7x = 21 + 63 7x = 21 + 63 Combine like terms: 21 + 63 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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