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Simplifying -12 + -5a = -3(4 + 7a) -12 + -5a = (4 * -3 + 7a * -3) -12 + -5a = (-12 + -21a) Add '12' to each side of the equation. -12 + 12 + -5a = -12 + 12 + -21a Combine like terms: -12 + 12 = 0 0 + -5a = -12 + 12 + -21a -5a = -12 + 12 + -21a Combine like terms: -12 + 12 = 0 -5a = 0 + -21a -5a = -21a Solving -5a = -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. -5a + 21a = -21a + 21a Combine like terms: -5a + 21a = 16a 16a = -21a + 21a Combine like terms: -21a + 21a = 0 16a = 0 Divide each side by '16'. a = 0 Simplifying a = 0
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