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Simplifying -39 + 3x = -3(1 + -7x) -39 + 3x = (1 * -3 + -7x * -3) -39 + 3x = (-3 + 21x) Solving -39 + 3x = -3 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -39 + 3x + -21x = -3 + 21x + -21x Combine like terms: 3x + -21x = -18x -39 + -18x = -3 + 21x + -21x Combine like terms: 21x + -21x = 0 -39 + -18x = -3 + 0 -39 + -18x = -3 Add '39' to each side of the equation. -39 + 39 + -18x = -3 + 39 Combine like terms: -39 + 39 = 0 0 + -18x = -3 + 39 -18x = -3 + 39 Combine like terms: -3 + 39 = 36 -18x = 36 Divide each side by '-18'. x = -2 Simplifying x = -2
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