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-3x=10 /: -3
x= 3 1/3
b)2x+12=30-3x
5x=18 / :5
x= 3 3/5
-3x=10
3x=10
x=3 1/3
b)
2x+3x=30-12
5x=18
x=3.6
-3x=11-1
-3x=10 /-3
x=-3 i jedna trzecia
b)2x+12=30-3x
2x+3x=30-12
5x=18 /:5
x= 3 i trzy piąte