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Simplifying 42 * 2 = 3a + -10a Multiply 42 * 2 84 = 3a + -10a Combine like terms: 3a + -10a = -7a 84 = -7a Solving 84 = -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. 84 + 7a = -7a + 7a Combine like terms: -7a + 7a = 0 84 + 7a = 0 Add '-84' to each side of the equation. 84 + -84 + 7a = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 7a = 0 + -84 7a = 0 + -84 Combine like terms: 0 + -84 = -84 7a = -84 Divide each side by '7'. a = -12 Simplifying a = -12
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