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Simplifying (7 + -21x) * 3 + 2(3.5x + -6) = 0 Reorder the terms for easier multiplication: 3(7 + -21x) + 2(3.5x + -6) = 0 (7 * 3 + -21x * 3) + 2(3.5x + -6) = 0 (21 + -63x) + 2(3.5x + -6) = 0 Reorder the terms: 21 + -63x + 2(-6 + 3.5x) = 0 21 + -63x + (-6 * 2 + 3.5x * 2) = 0 21 + -63x + (-12 + 7x) = 0 Reorder the terms: 21 + -12 + -63x + 7x = 0 Combine like terms: 21 + -12 = 9 9 + -63x + 7x = 0 Combine like terms: -63x + 7x = -56x 9 + -56x = 0 Solving 9 + -56x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -56x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -56x = 0 + -9 -56x = 0 + -9 Combine like terms: 0 + -9 = -9 -56x = -9 Divide each side by '-56'. x = 0.1607142857 Simplifying x = 0.1607142857
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