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Simplifying -30 + -7x = 75 + -21x Solving -30 + -7x = 75 + -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. -30 + -7x + 21x = 75 + -21x + 21x Combine like terms: -7x + 21x = 14x -30 + 14x = 75 + -21x + 21x Combine like terms: -21x + 21x = 0 -30 + 14x = 75 + 0 -30 + 14x = 75 Add '30' to each side of the equation. -30 + 30 + 14x = 75 + 30 Combine like terms: -30 + 30 = 0 0 + 14x = 75 + 30 14x = 75 + 30 Combine like terms: 75 + 30 = 105 14x = 105 Divide each side by '14'. x = 7.5 Simplifying x = 7.5
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