5x-6y=33 ②
①×5 -②×3:
15x+20y- 15x+ 18y = 50-99
38y=-49
y=-49/38
Substitute y=-49/38 into ① to get:
3x+ 4(-49/38)= 10
3x - 98/ 19 = 10
3x=98/ 19 + 10
3x=288/ 19
x= 96/ 19
So x=96/ 19 y=-49/38 is the solution of the original equation.