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2x=6 /:2
x=3 !!!!
3+2y=7 /-3
2y=4 /:2
y=2
b)
3(3y-7) +2y=1
9y-21+2y=1 /+21
11y=22 /:11
y=2 !!!
x=3*2-7=-1
x=-1