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Simplifying -6(7a + 7) = 210 Reorder the terms: -6(7 + 7a) = 210 (7 * -6 + 7a * -6) = 210 (-42 + -42a) = 210 Solving -42 + -42a = 210 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + -42a = 210 + 42 Combine like terms: -42 + 42 = 0 0 + -42a = 210 + 42 -42a = 210 + 42 Combine like terms: 210 + 42 = 252 -42a = 252 Divide each side by '-42'. a = -6 Simplifying a = -6
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