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4x-12= 18. 3x+5=15. 6+4x=20. Rezolvati ecuatiile

Răspuns :

4x-12=18
4x = 18 + 12
4x = 30
x = 30 :4
x = 7.5

3x + 5 =15
3x = 15 - 5
3x = 10
x = 10 : 3
x  = 3.5

6 + 4x = 20
 4x= 14
x = 14:4
x = 3.5






4x-12=18 
4x=18+12 ,4x =30 , x=30:4 = 7,5 
3x+5=15 , 3x=15-5  ,3x=10 ,x=10:3 =3,(3)
6+4x=20 ,4x=20-6 ,4x=14 ,x=3,5