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x. +2y. = 4
= 3x =4
x=4-3
x=1
4x+2y=8
4.1+2y=8
2y=8-2
2y=4
y=4/2
y=2
5a-b=3
a+b=2
4a=1
a=1-4
a=-3
5a-b=3
5.(-3)-b=3
-15-b=3
b=3+15
b=18