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Simplifying 4 * 21 = 7x Multiply 4 * 21 84 = 7x Solving 84 = 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. 84 + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 84 + -7x = 0 Add '-84' to each side of the equation. 84 + -84 + -7x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -7x = 0 + -84 -7x = 0 + -84 Combine like terms: 0 + -84 = -84 -7x = -84 Divide each side by '-7'. x = 12 Simplifying x = 12
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