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Simplifying a + -3 = 13 + -3a Reorder the terms: -3 + a = 13 + -3a Solving -3 + a = 13 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -3 + a + 3a = 13 + -3a + 3a Combine like terms: a + 3a = 4a -3 + 4a = 13 + -3a + 3a Combine like terms: -3a + 3a = 0 -3 + 4a = 13 + 0 -3 + 4a = 13 Add '3' to each side of the equation. -3 + 3 + 4a = 13 + 3 Combine like terms: -3 + 3 = 0 0 + 4a = 13 + 3 4a = 13 + 3 Combine like terms: 13 + 3 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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