Set it equal to 8x-12=4x then get like terms on the same side, that being 8x-4x=12. Solve that and it becomes 4x=12, divide by the greatest common factor to get x by itself (4) which leaves x=3. 3x4 is equal to 12 and 8x3(24)-12 is equal to 12. SU is equal to 24
