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Simplifying 3 * 21 = 7x Multiply 3 * 21 63 = 7x Solving 63 = 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. 63 + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 63 + -7x = 0 Add '-63' to each side of the equation. 63 + -63 + -7x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -7x = 0 + -63 -7x = 0 + -63 Combine like terms: 0 + -63 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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