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Simplifying 7x + -7 + 14x + 2 = 142 Reorder the terms: -7 + 2 + 7x + 14x = 142 Combine like terms: -7 + 2 = -5 -5 + 7x + 14x = 142 Combine like terms: 7x + 14x = 21x -5 + 21x = 142 Solving -5 + 21x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 21x = 142 + 5 Combine like terms: -5 + 5 = 0 0 + 21x = 142 + 5 21x = 142 + 5 Combine like terms: 142 + 5 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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