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Simplifying 4(21 + -1x) = 3x (21 * 4 + -1x * 4) = 3x (84 + -4x) = 3x Solving 84 + -4x = 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. 84 + -4x + -3x = 3x + -3x Combine like terms: -4x + -3x = -7x 84 + -7x = 3x + -3x Combine like terms: 3x + -3x = 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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