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Simplifying -7 = 3a + 4a Combine like terms: 3a + 4a = 7a -7 = 7a Solving -7 = 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 + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 -7 + -7a = 0 Add '7' to each side of the equation. -7 + 7 + -7a = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -7a = 0 + 7 -7a = 0 + 7 Combine like terms: 0 + 7 = 7 -7a = 7 Divide each side by '-7'. a = -1 Simplifying a = -1
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