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5-x<3x+21
Multiply both sides of the equation by 3. Since 3 is positive, the inequality direction remains the same.
5-x-3x<21
Subtract 3x from both sides.
5-4x<21
Combine -x and -3x to get -4x.
-4x<21-5
Subtract 5 from both sides.
-4x<16
Subtract 5 from 21 to get 16.
x>\frac{16}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
x>-4
Divide 16 by -4 to get -4.