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Simplifying -21 = -7 + -7(3x + 31) Reorder the terms: -21 = -7 + -7(31 + 3x) -21 = -7 + (31 * -7 + 3x * -7) -21 = -7 + (-217 + -21x) Combine like terms: -7 + -217 = -224 -21 = -224 + -21x Solving -21 = -224 + -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. -21 + 21x = -224 + -21x + 21x Combine like terms: -21x + 21x = 0 -21 + 21x = -224 + 0 -21 + 21x = -224 Add '21' to each side of the equation. -21 + 21 + 21x = -224 + 21 Combine like terms: -21 + 21 = 0 0 + 21x = -224 + 21 21x = -224 + 21 Combine like terms: -224 + 21 = -203 21x = -203 Divide each side by '21'. x = -9.666666667 Simplifying x = -9.666666667
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