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Simplifying -7a = -21 + -5a Solving -7a = -21 + -5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5a' to each side of the equation. -7a + 5a = -21 + -5a + 5a Combine like terms: -7a + 5a = -2a -2a = -21 + -5a + 5a Combine like terms: -5a + 5a = 0 -2a = -21 + 0 -2a = -21 Divide each side by '-2'. a = 10.5 Simplifying a = 10.5
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