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Simplifying 7 + -1(3 + 4a) + 2a = -5 7 + (3 * -1 + 4a * -1) + 2a = -5 7 + (-3 + -4a) + 2a = -5 Combine like terms: 7 + -3 = 4 4 + -4a + 2a = -5 Combine like terms: -4a + 2a = -2a 4 + -2a = -5 Solving 4 + -2a = -5 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2a = -5 + -4 Combine like terms: 4 + -4 = 0 0 + -2a = -5 + -4 -2a = -5 + -4 Combine like terms: -5 + -4 = -9 -2a = -9 Divide each side by '-2'. a = 4.5 Simplifying a = 4.5
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