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Simplifying -7 = -1(2 + 2a) + 9a -7 = (2 * -1 + 2a * -1) + 9a -7 = (-2 + -2a) + 9a Combine like terms: -2a + 9a = 7a -7 = -2 + 7a Solving -7 = -2 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. -7 + -7a = -2 + 7a + -7a Combine like terms: 7a + -7a = 0 -7 + -7a = -2 + 0 -7 + -7a = -2 Add '7' to each side of the equation. -7 + 7 + -7a = -2 + 7 Combine like terms: -7 + 7 = 0 0 + -7a = -2 + 7 -7a = -2 + 7 Combine like terms: -2 + 7 = 5 -7a = 5 Divide each side by '-7'. a = -0.7142857143 Simplifying a = -0.7142857143
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