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Simplifying 3a + -7 = 13 + 7a Reorder the terms: -7 + 3a = 13 + 7a Solving -7 + 3a = 13 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. -7 + 3a + -7a = 13 + 7a + -7a Combine like terms: 3a + -7a = -4a -7 + -4a = 13 + 7a + -7a Combine like terms: 7a + -7a = 0 -7 + -4a = 13 + 0 -7 + -4a = 13 Add '7' to each side of the equation. -7 + 7 + -4a = 13 + 7 Combine like terms: -7 + 7 = 0 0 + -4a = 13 + 7 -4a = 13 + 7 Combine like terms: 13 + 7 = 20 -4a = 20 Divide each side by '-4'. a = -5 Simplifying a = -5
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