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Simplifying 4a + -7 + 3(a + -4) = 9 Reorder the terms: 4a + -7 + 3(-4 + a) = 9 4a + -7 + (-4 * 3 + a * 3) = 9 4a + -7 + (-12 + 3a) = 9 Reorder the terms: -7 + -12 + 4a + 3a = 9 Combine like terms: -7 + -12 = -19 -19 + 4a + 3a = 9 Combine like terms: 4a + 3a = 7a -19 + 7a = 9 Solving -19 + 7a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + 7a = 9 + 19 Combine like terms: -19 + 19 = 0 0 + 7a = 9 + 19 7a = 9 + 19 Combine like terms: 9 + 19 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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