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Simplifying 4 + -0.8(3a + 4) = 7 Reorder the terms: 4 + -0.8(4 + 3a) = 7 4 + (4 * -0.8 + 3a * -0.8) = 7 4 + (-3.2 + -2.4a) = 7 Combine like terms: 4 + -3.2 = 0.8 0.8 + -2.4a = 7 Solving 0.8 + -2.4a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + -2.4a = 7 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + -2.4a = 7 + -0.8 -2.4a = 7 + -0.8 Combine like terms: 7 + -0.8 = 6.2 -2.4a = 6.2 Divide each side by '-2.4'. a = -2.583333333 Simplifying a = -2.583333333
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