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Simplifying 90 = -3(7a + -2) Reorder the terms: 90 = -3(-2 + 7a) 90 = (-2 * -3 + 7a * -3) 90 = (6 + -21a) Solving 90 = 6 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. 90 + 21a = 6 + -21a + 21a Combine like terms: -21a + 21a = 0 90 + 21a = 6 + 0 90 + 21a = 6 Add '-90' to each side of the equation. 90 + -90 + 21a = 6 + -90 Combine like terms: 90 + -90 = 0 0 + 21a = 6 + -90 21a = 6 + -90 Combine like terms: 6 + -90 = -84 21a = -84 Divide each side by '21'. a = -4 Simplifying a = -4
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