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Simplifying -7 + 21 = -4x Combine like terms: -7 + 21 = 14 14 = -4x Solving 14 = -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 14 + 4x = -4x + 4x Combine like terms: -4x + 4x = 0 14 + 4x = 0 Add '-14' to each side of the equation. 14 + -14 + 4x = 0 + -14 Combine like terms: 14 + -14 = 0 0 + 4x = 0 + -14 4x = 0 + -14 Combine like terms: 0 + -14 = -14 4x = -14 Divide each side by '4'. x = -3.5 Simplifying x = -3.5
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