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5x-18y=-21
5x=-21+18y
x=-21+18y/5
16(-21+18y/5)+27y=-6
-336+228y/5+27y=-6
-336/5+228y/5+27y=-6
228y/5+135y/5=-6+336/5
363y/5=-30/5+336/5
363y=-30+363
363y=333
y=333/363
x=-21+18*333/363/5
x=-21+5994/363/5
x=-21+5994/1815
x=-38115/1815+5994/1815
x=-32121/1815