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Simplifying -217 = 7(-7 + -3x) -217 = (-7 * 7 + -3x * 7) -217 = (-49 + -21x) Solving -217 = -49 + -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. -217 + 21x = -49 + -21x + 21x Combine like terms: -21x + 21x = 0 -217 + 21x = -49 + 0 -217 + 21x = -49 Add '217' to each side of the equation. -217 + 217 + 21x = -49 + 217 Combine like terms: -217 + 217 = 0 0 + 21x = -49 + 217 21x = -49 + 217 Combine like terms: -49 + 217 = 168 21x = 168 Divide each side by '21'. x = 8 Simplifying x = 8
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