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Simplifying 12 + -7x = 90 + -21x Solving 12 + -7x = 90 + -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. 12 + -7x + 21x = 90 + -21x + 21x Combine like terms: -7x + 21x = 14x 12 + 14x = 90 + -21x + 21x Combine like terms: -21x + 21x = 0 12 + 14x = 90 + 0 12 + 14x = 90 Add '-12' to each side of the equation. 12 + -12 + 14x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 14x = 90 + -12 14x = 90 + -12 Combine like terms: 90 + -12 = 78 14x = 78 Divide each side by '14'. x = 5.571428571 Simplifying x = 5.571428571
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