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Simplifying 42x + 21 = 7x + 21 Reorder the terms: 21 + 42x = 7x + 21 Reorder the terms: 21 + 42x = 21 + 7x Add '-21' to each side of the equation. 21 + -21 + 42x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 0 + 42x = 21 + -21 + 7x 42x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 42x = 0 + 7x 42x = 7x Solving 42x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 42x + -7x = 7x + -7x Combine like terms: 42x + -7x = 35x 35x = 7x + -7x Combine like terms: 7x + -7x = 0 35x = 0 Divide each side by '35'. x = 0 Simplifying x = 0
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