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Simplifying 1 + -9a = -15 + -2a Solving 1 + -9a = -15 + -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. 1 + -9a + 2a = -15 + -2a + 2a Combine like terms: -9a + 2a = -7a 1 + -7a = -15 + -2a + 2a Combine like terms: -2a + 2a = 0 1 + -7a = -15 + 0 1 + -7a = -15 Add '-1' to each side of the equation. 1 + -1 + -7a = -15 + -1 Combine like terms: 1 + -1 = 0 0 + -7a = -15 + -1 -7a = -15 + -1 Combine like terms: -15 + -1 = -16 -7a = -16 Divide each side by '-7'. a = 2.285714286 Simplifying a = 2.285714286
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