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Simplifying 9x + -1(2x + -12) = 42 Reorder the terms: 9x + -1(-12 + 2x) = 42 9x + (-12 * -1 + 2x * -1) = 42 9x + (12 + -2x) = 42 Reorder the terms: 12 + 9x + -2x = 42 Combine like terms: 9x + -2x = 7x 12 + 7x = 42 Solving 12 + 7x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 7x = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 7x = 42 + -12 7x = 42 + -12 Combine like terms: 42 + -12 = 30 7x = 30 Divide each side by '7'. x = 4.285714286 Simplifying x = 4.285714286
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