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Simplifying 21x + 4 = 7x Reorder the terms: 4 + 21x = 7x Solving 4 + 21x = 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. 4 + 21x + -7x = 7x + -7x Combine like terms: 21x + -7x = 14x 4 + 14x = 7x + -7x Combine like terms: 7x + -7x = 0 4 + 14x = 0 Add '-4' to each side of the equation. 4 + -4 + 14x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 14x = 0 + -4 14x = 0 + -4 Combine like terms: 0 + -4 = -4 14x = -4 Divide each side by '14'. x = -0.2857142857 Simplifying x = -0.2857142857
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