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Simplifying -18 + 7a = 2a + 3 + 4 Reorder the terms: -18 + 7a = 3 + 4 + 2a Combine like terms: 3 + 4 = 7 -18 + 7a = 7 + 2a Solving -18 + 7a = 7 + 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. -18 + 7a + -2a = 7 + 2a + -2a Combine like terms: 7a + -2a = 5a -18 + 5a = 7 + 2a + -2a Combine like terms: 2a + -2a = 0 -18 + 5a = 7 + 0 -18 + 5a = 7 Add '18' to each side of the equation. -18 + 18 + 5a = 7 + 18 Combine like terms: -18 + 18 = 0 0 + 5a = 7 + 18 5a = 7 + 18 Combine like terms: 7 + 18 = 25 5a = 25 Divide each side by '5'. a = 5 Simplifying a = 5
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