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Simplifying 7a = 2(a + -20) + 30 Reorder the terms: 7a = 2(-20 + a) + 30 7a = (-20 * 2 + a * 2) + 30 7a = (-40 + 2a) + 30 Reorder the terms: 7a = -40 + 30 + 2a Combine like terms: -40 + 30 = -10 7a = -10 + 2a Solving 7a = -10 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 7a + -2a = -10 + 2a + -2a Combine like terms: 7a + -2a = 5a 5a = -10 + 2a + -2a Combine like terms: 2a + -2a = 0 5a = -10 + 0 5a = -10 Divide each side by '5'. a = -2 Simplifying a = -2
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