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Simplifying 4 + -0.75(3a + 4) = 7 Reorder the terms: 4 + -0.75(4 + 3a) = 7 4 + (4 * -0.75 + 3a * -0.75) = 7 4 + (-3 + -2.25a) = 7 Combine like terms: 4 + -3 = 1 1 + -2.25a = 7 Solving 1 + -2.25a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2.25a = 7 + -1 Combine like terms: 1 + -1 = 0 0 + -2.25a = 7 + -1 -2.25a = 7 + -1 Combine like terms: 7 + -1 = 6 -2.25a = 6 Divide each side by '-2.25'. a = -2.666666667 Simplifying a = -2.666666667
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