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Simplifying 21 = 3x + 4x Combine like terms: 3x + 4x = 7x 21 = 7x Solving 21 = 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. 21 + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = 0 Add '-21' to each side of the equation. 21 + -21 + -7x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 0 + -21 -7x = 0 + -21 Combine like terms: 0 + -21 = -21 -7x = -21 Divide each side by '-7'. x = 3 Simplifying x = 3
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