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Simplifying (21x) + -1(18x + 7) = 0 Reorder the terms: (21x) + -1(7 + 18x) = 0 (21x) + (7 * -1 + 18x * -1) = 0 (21x) + (-7 + -18x) = 0 Reorder the terms: -7 + (21x) + -18x = 0 Combine like terms: (21x) + -18x = 3x -7 + 3x = 0 Solving -7 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 3x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 3x = 0 + 7 3x = 0 + 7 Combine like terms: 0 + 7 = 7 3x = 7 Divide each side by '3'. x = 2.333333333 Simplifying x = 2.333333333
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