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Simplifying -2a + 7 + -3(-1a + -4a) = 0 Combine like terms: -1a + -4a = -5a -2a + 7 + -3(-5a) = 0 Remove parenthesis around (-5a) -2a + 7 + -3 * -5a = 0 Multiply -3 * -5 -2a + 7 + 15a = 0 Reorder the terms: 7 + -2a + 15a = 0 Combine like terms: -2a + 15a = 13a 7 + 13a = 0 Solving 7 + 13a = 0 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 + 13a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 13a = 0 + -7 13a = 0 + -7 Combine like terms: 0 + -7 = -7 13a = -7 Divide each side by '13'. a = -0.5384615385 Simplifying a = -0.5384615385
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