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Simplifying -3a + -7 = -12 + -2a Reorder the terms: -7 + -3a = -12 + -2a Solving -7 + -3a = -12 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -7 + -3a + 2a = -12 + -2a + 2a Combine like terms: -3a + 2a = -1a -7 + -1a = -12 + -2a + 2a Combine like terms: -2a + 2a = 0 -7 + -1a = -12 + 0 -7 + -1a = -12 Add '7' to each side of the equation. -7 + 7 + -1a = -12 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = -12 + 7 -1a = -12 + 7 Combine like terms: -12 + 7 = -5 -1a = -5 Divide each side by '-1'. a = 5 Simplifying a = 5
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