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Simplifying (a + -20) * 7 = 21 Reorder the terms: (-20 + a) * 7 = 21 Reorder the terms for easier multiplication: 7(-20 + a) = 21 (-20 * 7 + a * 7) = 21 (-140 + 7a) = 21 Solving -140 + 7a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '140' to each side of the equation. -140 + 140 + 7a = 21 + 140 Combine like terms: -140 + 140 = 0 0 + 7a = 21 + 140 7a = 21 + 140 Combine like terms: 21 + 140 = 161 7a = 161 Divide each side by '7'. a = 23 Simplifying a = 23
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