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2014-11-12T12:29:46+02:00
8a+12=2a+36
8a-2a=36-12
6a=24
a=24/6
a=4

2014-11-12T13:04:58+02:00
C)5m+37=2m+52
5m-2m=52-37
3m=15⇒m=15:3
             m=5
d)8a+12=2a+36
8a-2a=36-12
6a=24⇒a=24:6
            a=4