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4x+31=2x ???
6x+10=213 ???


Răspuns :

4x+31=2x
4x-2x=31
2x=31
x=31/2
(x=15,5)

6x+10=213
6x=213-10
6x=203
x=203/6
(x=33,83)

4x+31=2x
2x=31
x= 31: 2
x=15,5
6x+10 =213 
6x=213-10
6x=203
x=203:6
x=33,83