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Simplifying -88 = -1 + -3(1 + 7x) -88 = -1 + (1 * -3 + 7x * -3) -88 = -1 + (-3 + -21x) Combine like terms: -1 + -3 = -4 -88 = -4 + -21x Solving -88 = -4 + -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. -88 + 21x = -4 + -21x + 21x Combine like terms: -21x + 21x = 0 -88 + 21x = -4 + 0 -88 + 21x = -4 Add '88' to each side of the equation. -88 + 88 + 21x = -4 + 88 Combine like terms: -88 + 88 = 0 0 + 21x = -4 + 88 21x = -4 + 88 Combine like terms: -4 + 88 = 84 21x = 84 Divide each side by '21'. x = 4 Simplifying x = 4
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