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Simplifying (12 + -3a) + (-7 + -4a) = 0 Remove parenthesis around (12 + -3a) 12 + -3a + (-7 + -4a) = 0 Remove parenthesis around (-7 + -4a) 12 + -3a + -7 + -4a = 0 Reorder the terms: 12 + -7 + -3a + -4a = 0 Combine like terms: 12 + -7 = 5 5 + -3a + -4a = 0 Combine like terms: -3a + -4a = -7a 5 + -7a = 0 Solving 5 + -7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7a = 0 + -5 -7a = 0 + -5 Combine like terms: 0 + -5 = -5 -7a = -5 Divide each side by '-7'. a = 0.7142857143 Simplifying a = 0.7142857143
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