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Simplifying -1(3 + 7x) = -21 + 2x (3 * -1 + 7x * -1) = -21 + 2x (-3 + -7x) = -21 + 2x Solving -3 + -7x = -21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -3 + -7x + -2x = -21 + 2x + -2x Combine like terms: -7x + -2x = -9x -3 + -9x = -21 + 2x + -2x Combine like terms: 2x + -2x = 0 -3 + -9x = -21 + 0 -3 + -9x = -21 Add '3' to each side of the equation. -3 + 3 + -9x = -21 + 3 Combine like terms: -3 + 3 = 0 0 + -9x = -21 + 3 -9x = -21 + 3 Combine like terms: -21 + 3 = -18 -9x = -18 Divide each side by '-9'. x = 2 Simplifying x = 2
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