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Simplifying -3(1 + -7x) = 7x (1 * -3 + -7x * -3) = 7x (-3 + 21x) = 7x Solving -3 + 21x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -3 + 21x + -7x = 7x + -7x Combine like terms: 21x + -7x = 14x -3 + 14x = 7x + -7x Combine like terms: 7x + -7x = 0 -3 + 14x = 0 Add '3' to each side of the equation. -3 + 3 + 14x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 14x = 0 + 3 14x = 0 + 3 Combine like terms: 0 + 3 = 3 14x = 3 Divide each side by '14'. x = 0.2142857143 Simplifying x = 0.2142857143
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