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Simplifying 91 = -7(-4 + 3x) 91 = (-4 * -7 + 3x * -7) 91 = (28 + -21x) Solving 91 = 28 + -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. 91 + 21x = 28 + -21x + 21x Combine like terms: -21x + 21x = 0 91 + 21x = 28 + 0 91 + 21x = 28 Add '-91' to each side of the equation. 91 + -91 + 21x = 28 + -91 Combine like terms: 91 + -91 = 0 0 + 21x = 28 + -91 21x = 28 + -91 Combine like terms: 28 + -91 = -63 21x = -63 Divide each side by '21'. x = -3 Simplifying x = -3
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