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Simplifying 7 + 21x = 28 + 14x Solving 7 + 21x = 28 + 14x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14x' to each side of the equation. 7 + 21x + -14x = 28 + 14x + -14x Combine like terms: 21x + -14x = 7x 7 + 7x = 28 + 14x + -14x Combine like terms: 14x + -14x = 0 7 + 7x = 28 + 0 7 + 7x = 28 Add '-7' to each side of the equation. 7 + -7 + 7x = 28 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 28 + -7 7x = 28 + -7 Combine like terms: 28 + -7 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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