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Simplifying 21x = 7(20 + -1x) 21x = (20 * 7 + -1x * 7) 21x = (140 + -7x) Solving 21x = 140 + -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. 21x + 7x = 140 + -7x + 7x Combine like terms: 21x + 7x = 28x 28x = 140 + -7x + 7x Combine like terms: -7x + 7x = 0 28x = 140 + 0 28x = 140 Divide each side by '28'. x = 5 Simplifying x = 5
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