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Simplifying 7(3a + -4) = 63 Reorder the terms: 7(-4 + 3a) = 63 (-4 * 7 + 3a * 7) = 63 (-28 + 21a) = 63 Solving -28 + 21a = 63 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 21a = 63 + 28 Combine like terms: -28 + 28 = 0 0 + 21a = 63 + 28 21a = 63 + 28 Combine like terms: 63 + 28 = 91 21a = 91 Divide each side by '21'. a = 4.333333333 Simplifying a = 4.333333333
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