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Simplifying -7 + 2x = -7(1 + 3x) -7 + 2x = (1 * -7 + 3x * -7) -7 + 2x = (-7 + -21x) Add '7' to each side of the equation. -7 + 7 + 2x = -7 + 7 + -21x Combine like terms: -7 + 7 = 0 0 + 2x = -7 + 7 + -21x 2x = -7 + 7 + -21x Combine like terms: -7 + 7 = 0 2x = 0 + -21x 2x = -21x Solving 2x = -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. 2x + 21x = -21x + 21x Combine like terms: 2x + 21x = 23x 23x = -21x + 21x Combine like terms: -21x + 21x = 0 23x = 0 Divide each side by '23'. x = 0 Simplifying x = 0
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