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Simplifying 6a + -3(4 + 5a) = 30 6a + (4 * -3 + 5a * -3) = 30 6a + (-12 + -15a) = 30 Reorder the terms: -12 + 6a + -15a = 30 Combine like terms: 6a + -15a = -9a -12 + -9a = 30 Solving -12 + -9a = 30 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -9a = 30 + 12 Combine like terms: -12 + 12 = 0 0 + -9a = 30 + 12 -9a = 30 + 12 Combine like terms: 30 + 12 = 42 -9a = 42 Divide each side by '-9'. a = -4.666666667 Simplifying a = -4.666666667
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