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Simplifying 3x + 1 = (-1x) + 21 Reorder the terms: 1 + 3x = (-1x) + 21 Reorder the terms: 1 + 3x = 21 + (-1x) Solving 1 + 3x = 21 + (-1x) Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '(x)' to each side of the equation. 1 + 3x + (x) = 21 + (-1x) + (x) 1 + 3x + x = 21 + (-1x) + (x) Combine like terms: 3x + x = 4x 1 + 4x = 21 + (-1x) + (x) 1 + 4x = 21 + (-1x) + x Combine like terms: (-1x) + x = 0 1 + 4x = 21 + 0 1 + 4x = 21 Add '-1' to each side of the equation. 1 + -1 + 4x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 4x = 21 + -1 4x = 21 + -1 Combine like terms: 21 + -1 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
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