3х+25=16
3х=16-25
3х=-9
х=-3
4•(-3)+3b=-3
-12+3b=-3
3b=-3+12
3b=9
b=3
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3х+25=16
3х=16-25
3х=-9
х=-3
4•(-3)+3b=-3
-12+3b=-3
3b=-3+12
3b=9
b=3