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