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Simplifying 7 + 2(-3a) = 9 Remove parenthesis around (-3a) 7 + 2 * -3a = 9 Multiply 2 * -3 7 + -6a = 9 Solving 7 + -6a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -6a = 9 + -7 Combine like terms: 7 + -7 = 0 0 + -6a = 9 + -7 -6a = 9 + -7 Combine like terms: 9 + -7 = 2 -6a = 2 Divide each side by '-6'. a = -0.3333333333 Simplifying a = -0.3333333333
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