solve for x: -(4/5x)+(2/15)=(2/3)
-(4/5x)+(2/15)=(2/3) multiply both sides by -1 (i.e. change the sign of all terms)
(4/5x) - (2/15)= -(2/3) add (2/15) to both sides
(4/5)x = -(2/3) + (2/15) = -(10/15) + (2/15) = -(8/15)
(4/5)x = -(8/15) multiply both sides by (5/4)
x = -(8/15)(5/4) = -(2/3)
x = -(2/3)