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Simplifying 4x + 3 + -7 = 21 Reorder the terms: 3 + -7 + 4x = 21 Combine like terms: 3 + -7 = -4 -4 + 4x = 21 Solving -4 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 4x = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 4x = 21 + 4 4x = 21 + 4 Combine like terms: 21 + 4 = 25 4x = 25 Divide each side by '4'. x = 6.25 Simplifying x = 6.25
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