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Simplifying 3(7x + -21) = 3 Reorder the terms: 3(-21 + 7x) = 3 (-21 * 3 + 7x * 3) = 3 (-63 + 21x) = 3 Solving -63 + 21x = 3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 21x = 3 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 3 + 63 21x = 3 + 63 Combine like terms: 3 + 63 = 66 21x = 66 Divide each side by '21'. x = 3.142857143 Simplifying x = 3.142857143
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