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rezolvati in N;
b)3(2x-4)+x=37
e)2x+3x=20
h)2(x+5)=18
c)4(7x+1)+12=44
f)8x+5-4x=41
i)3(x+2)-2x=10


Răspuns :

6x-12+x=37
7x=37+12
7x=49
x=49:7=7

5x=20
x=20:5=4

2x+10=18
2x=18-10
x=8:2
x=4

28x+4+12=44
28x=44-16
x=28:28
x=1

4x+5=41
4x=41-5
x=36:4
x=9

3x+6-2x=10
x=10-6
x=4

b)x=7;
e)x=4;
h)x=4;
c)x=4;
f)x=9;
i)x=4;