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Simplifying -3(7x + -1) + 4 = 21x + 7 Reorder the terms: -3(-1 + 7x) + 4 = 21x + 7 (-1 * -3 + 7x * -3) + 4 = 21x + 7 (3 + -21x) + 4 = 21x + 7 Reorder the terms: 3 + 4 + -21x = 21x + 7 Combine like terms: 3 + 4 = 7 7 + -21x = 21x + 7 Reorder the terms: 7 + -21x = 7 + 21x Add '-7' to each side of the equation. 7 + -7 + -21x = 7 + -7 + 21x Combine like terms: 7 + -7 = 0 0 + -21x = 7 + -7 + 21x -21x = 7 + -7 + 21x Combine like terms: 7 + -7 = 0 -21x = 0 + 21x -21x = 21x Solving -21x = 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. -21x + -21x = 21x + -21x Combine like terms: -21x + -21x = -42x -42x = 21x + -21x Combine like terms: 21x + -21x = 0 -42x = 0 Divide each side by '-42'. x = 0 Simplifying x = 0
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