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x=1+3y
2(1+3y)-5y=7
x=1+3y
y=5
y=5
x=16
b)
y=4+2x
4x-3(4+2x)=2
-2x=14=> x=-7
y=4-14=-10
c)
y=3-2x
x-2(3-2x)=4
5x=10=> x=2
y=3-4=> y=-1