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Simplifying 9 + -1(7a) = 12 Remove parenthesis around (7a) 9 + -1 * 7a = 12 Multiply -1 * 7 9 + -7a = 12 Solving 9 + -7a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -7a = 12 + -9 Combine like terms: 9 + -9 = 0 0 + -7a = 12 + -9 -7a = 12 + -9 Combine like terms: 12 + -9 = 3 -7a = 3 Divide each side by '-7'. a = -0.4285714286 Simplifying a = -0.4285714286
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