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Simplifying 7(a + 9) = 3(a + -4 + -1a) Reorder the terms: 7(9 + a) = 3(a + -4 + -1a) (9 * 7 + a * 7) = 3(a + -4 + -1a) (63 + 7a) = 3(a + -4 + -1a) Reorder the terms: 63 + 7a = 3(-4 + a + -1a) Combine like terms: a + -1a = 0 63 + 7a = 3(-4 + 0) 63 + 7a = 3(-4) Multiply 3 * -4 63 + 7a = -12 Solving 63 + 7a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 7a = -12 + -63 Combine like terms: 63 + -63 = 0 0 + 7a = -12 + -63 7a = -12 + -63 Combine like terms: -12 + -63 = -75 7a = -75 Divide each side by '7'. a = -10.71428571 Simplifying a = -10.71428571
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