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Simplifying 7 * 3(2x + -1) = 9 Reorder the terms: 7 * 3(-1 + 2x) = 9 Multiply 7 * 3 21(-1 + 2x) = 9 (-1 * 21 + 2x * 21) = 9 (-21 + 42x) = 9 Solving -21 + 42x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 42x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 42x = 9 + 21 42x = 9 + 21 Combine like terms: 9 + 21 = 30 42x = 30 Divide each side by '42'. x = 0.7142857143 Simplifying x = 0.7142857143
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