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