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Simplifying 7a + 3(-4a + -5) = -65 Reorder the terms: 7a + 3(-5 + -4a) = -65 7a + (-5 * 3 + -4a * 3) = -65 7a + (-15 + -12a) = -65 Reorder the terms: -15 + 7a + -12a = -65 Combine like terms: 7a + -12a = -5a -15 + -5a = -65 Solving -15 + -5a = -65 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -5a = -65 + 15 Combine like terms: -15 + 15 = 0 0 + -5a = -65 + 15 -5a = -65 + 15 Combine like terms: -65 + 15 = -50 -5a = -50 Divide each side by '-5'. a = 10 Simplifying a = 10
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