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Simplifying 7(3x + -1) + -21 = 0 Reorder the terms: 7(-1 + 3x) + -21 = 0 (-1 * 7 + 3x * 7) + -21 = 0 (-7 + 21x) + -21 = 0 Reorder the terms: -7 + -21 + 21x = 0 Combine like terms: -7 + -21 = -28 -28 + 21x = 0 Solving -28 + 21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 21x = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 21x = 0 + 28 21x = 0 + 28 Combine like terms: 0 + 28 = 28 21x = 28 Divide each side by '21'. x = 1.333333333 Simplifying x = 1.333333333
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