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Simplifying 2a + 7 = 4a + 15 Reorder the terms: 7 + 2a = 4a + 15 Reorder the terms: 7 + 2a = 15 + 4a Solving 7 + 2a = 15 + 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. 7 + 2a + -4a = 15 + 4a + -4a Combine like terms: 2a + -4a = -2a 7 + -2a = 15 + 4a + -4a Combine like terms: 4a + -4a = 0 7 + -2a = 15 + 0 7 + -2a = 15 Add '-7' to each side of the equation. 7 + -7 + -2a = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -2a = 15 + -7 -2a = 15 + -7 Combine like terms: 15 + -7 = 8 -2a = 8 Divide each side by '-2'. a = -4 Simplifying a = -4
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