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Simplifying 2a + -7(-3a + -4) = -150 Reorder the terms: 2a + -7(-4 + -3a) = -150 2a + (-4 * -7 + -3a * -7) = -150 2a + (28 + 21a) = -150 Reorder the terms: 28 + 2a + 21a = -150 Combine like terms: 2a + 21a = 23a 28 + 23a = -150 Solving 28 + 23a = -150 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 23a = -150 + -28 Combine like terms: 28 + -28 = 0 0 + 23a = -150 + -28 23a = -150 + -28 Combine like terms: -150 + -28 = -178 23a = -178 Divide each side by '23'. a = -7.739130435 Simplifying a = -7.739130435
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