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Simplifying 4 + -2a = 3(a + -7) Reorder the terms: 4 + -2a = 3(-7 + a) 4 + -2a = (-7 * 3 + a * 3) 4 + -2a = (-21 + 3a) Solving 4 + -2a = -21 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 4 + -2a + -3a = -21 + 3a + -3a Combine like terms: -2a + -3a = -5a 4 + -5a = -21 + 3a + -3a Combine like terms: 3a + -3a = 0 4 + -5a = -21 + 0 4 + -5a = -21 Add '-4' to each side of the equation. 4 + -4 + -5a = -21 + -4 Combine like terms: 4 + -4 = 0 0 + -5a = -21 + -4 -5a = -21 + -4 Combine like terms: -21 + -4 = -25 -5a = -25 Divide each side by '-5'. a = 5 Simplifying a = 5
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