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Simplifying 7x + -7 = 13 + 21x Reorder the terms: -7 + 7x = 13 + 21x Solving -7 + 7x = 13 + 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. -7 + 7x + -21x = 13 + 21x + -21x Combine like terms: 7x + -21x = -14x -7 + -14x = 13 + 21x + -21x Combine like terms: 21x + -21x = 0 -7 + -14x = 13 + 0 -7 + -14x = 13 Add '7' to each side of the equation. -7 + 7 + -14x = 13 + 7 Combine like terms: -7 + 7 = 0 0 + -14x = 13 + 7 -14x = 13 + 7 Combine like terms: 13 + 7 = 20 -14x = 20 Divide each side by '-14'. x = -1.428571429 Simplifying x = -1.428571429
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