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Simplifying 63 + 12a = 15a Solving 63 + 12a = 15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15a' to each side of the equation. 63 + 12a + -15a = 15a + -15a Combine like terms: 12a + -15a = -3a 63 + -3a = 15a + -15a Combine like terms: 15a + -15a = 0 63 + -3a = 0 Add '-63' to each side of the equation. 63 + -63 + -3a = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -3a = 0 + -63 -3a = 0 + -63 Combine like terms: 0 + -63 = -63 -3a = -63 Divide each side by '-3'. a = 21 Simplifying a = 21
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