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Simplifying 3 + x = 7x + -21 Reorder the terms: 3 + x = -21 + 7x Solving 3 + x = -21 + 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. 3 + x + -7x = -21 + 7x + -7x Combine like terms: x + -7x = -6x 3 + -6x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 3 + -6x = -21 + 0 3 + -6x = -21 Add '-3' to each side of the equation. 3 + -3 + -6x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + -6x = -21 + -3 -6x = -21 + -3 Combine like terms: -21 + -3 = -24 -6x = -24 Divide each side by '-6'. x = 4 Simplifying x = 4
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