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Simplifying 4x = 3(7 + -1x) 4x = (7 * 3 + -1x * 3) 4x = (21 + -3x) Solving 4x = 21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 4x + 3x = 21 + -3x + 3x Combine like terms: 4x + 3x = 7x 7x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 7x = 21 + 0 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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