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Simplifying -7 + 21a = 15 + -25a Solving -7 + 21a = 15 + -25a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '25a' to each side of the equation. -7 + 21a + 25a = 15 + -25a + 25a Combine like terms: 21a + 25a = 46a -7 + 46a = 15 + -25a + 25a Combine like terms: -25a + 25a = 0 -7 + 46a = 15 + 0 -7 + 46a = 15 Add '7' to each side of the equation. -7 + 7 + 46a = 15 + 7 Combine like terms: -7 + 7 = 0 0 + 46a = 15 + 7 46a = 15 + 7 Combine like terms: 15 + 7 = 22 46a = 22 Divide each side by '46'. a = 0.4782608696 Simplifying a = 0.4782608696
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