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Simplifying 105 + -7x = 7x + 21 Reorder the terms: 105 + -7x = 21 + 7x Solving 105 + -7x = 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. 105 + -7x + -7x = 21 + 7x + -7x Combine like terms: -7x + -7x = -14x 105 + -14x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 105 + -14x = 21 + 0 105 + -14x = 21 Add '-105' to each side of the equation. 105 + -105 + -14x = 21 + -105 Combine like terms: 105 + -105 = 0 0 + -14x = 21 + -105 -14x = 21 + -105 Combine like terms: 21 + -105 = -84 -14x = -84 Divide each side by '-14'. x = 6 Simplifying x = 6
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