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Simplifying 9(3a + -7) = (4 + a) Reorder the terms: 9(-7 + 3a) = (4 + a) (-7 * 9 + 3a * 9) = (4 + a) (-63 + 27a) = (4 + a) Remove parenthesis around (4 + a) -63 + 27a = 4 + a Solving -63 + 27a = 4 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -63 + 27a + -1a = 4 + a + -1a Combine like terms: 27a + -1a = 26a -63 + 26a = 4 + a + -1a Combine like terms: a + -1a = 0 -63 + 26a = 4 + 0 -63 + 26a = 4 Add '63' to each side of the equation. -63 + 63 + 26a = 4 + 63 Combine like terms: -63 + 63 = 0 0 + 26a = 4 + 63 26a = 4 + 63 Combine like terms: 4 + 63 = 67 26a = 67 Divide each side by '26'. a = 2.576923077 Simplifying a = 2.576923077
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