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Simplifying 3(7x + -21) = -4 Reorder the terms: 3(-21 + 7x) = -4 (-21 * 3 + 7x * 3) = -4 (-63 + 21x) = -4 Solving -63 + 21x = -4 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 = -4 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = -4 + 63 21x = -4 + 63 Combine like terms: -4 + 63 = 59 21x = 59 Divide each side by '21'. x = 2.80952381 Simplifying x = 2.80952381
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