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Simplifying 8a + -7 = 4a + -9 Reorder the terms: -7 + 8a = 4a + -9 Reorder the terms: -7 + 8a = -9 + 4a Solving -7 + 8a = -9 + 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 + 8a + -4a = -9 + 4a + -4a Combine like terms: 8a + -4a = 4a -7 + 4a = -9 + 4a + -4a Combine like terms: 4a + -4a = 0 -7 + 4a = -9 + 0 -7 + 4a = -9 Add '7' to each side of the equation. -7 + 7 + 4a = -9 + 7 Combine like terms: -7 + 7 = 0 0 + 4a = -9 + 7 4a = -9 + 7 Combine like terms: -9 + 7 = -2 4a = -2 Divide each side by '4'. a = -0.5 Simplifying a = -0.5
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