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Simplifying 5 = 3x + 21 + -7x Reorder the terms: 5 = 21 + 3x + -7x Combine like terms: 3x + -7x = -4x 5 = 21 + -4x Solving 5 = 21 + -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. 5 + 4x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 5 + 4x = 21 + 0 5 + 4x = 21 Add '-5' to each side of the equation. 5 + -5 + 4x = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 4x = 21 + -5 4x = 21 + -5 Combine like terms: 21 + -5 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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