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Simplifying -13 = 7 + 4a Solving -13 = 7 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. -13 + -4a = 7 + 4a + -4a Combine like terms: 4a + -4a = 0 -13 + -4a = 7 + 0 -13 + -4a = 7 Add '13' to each side of the equation. -13 + 13 + -4a = 7 + 13 Combine like terms: -13 + 13 = 0 0 + -4a = 7 + 13 -4a = 7 + 13 Combine like terms: 7 + 13 = 20 -4a = 20 Divide each side by '-4'. a = -5 Simplifying a = -5
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