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Simplifying -4(1 + 7x) = -25 + -7x (1 * -4 + 7x * -4) = -25 + -7x (-4 + -28x) = -25 + -7x Solving -4 + -28x = -25 + -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. -4 + -28x + 7x = -25 + -7x + 7x Combine like terms: -28x + 7x = -21x -4 + -21x = -25 + -7x + 7x Combine like terms: -7x + 7x = 0 -4 + -21x = -25 + 0 -4 + -21x = -25 Add '4' to each side of the equation. -4 + 4 + -21x = -25 + 4 Combine like terms: -4 + 4 = 0 0 + -21x = -25 + 4 -21x = -25 + 4 Combine like terms: -25 + 4 = -21 -21x = -21 Divide each side by '-21'. x = 1 Simplifying x = 1
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