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Simplifying 21x + 4 = 90 Reorder the terms: 4 + 21x = 90 Solving 4 + 21x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 21x = 90 + -4 Combine like terms: 4 + -4 = 0 0 + 21x = 90 + -4 21x = 90 + -4 Combine like terms: 90 + -4 = 86 21x = 86 Divide each side by '21'. x = 4.095238095 Simplifying x = 4.095238095
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