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1. Rezolvati in multimea numerelor intregi ecuatiile :
a) 5(2x+3)=7x-21
b) 3(19-x)=4x-13
c)8-4x=2(14+3x)
2. rezolvati urmatoarele ecuatii , unde x e Z :
a) 12+4(4x-3)=6(3x-1)
b) 5(2x-3)=4(3x+7)-13
c)6(5-3x)=20-5(4+3x)


Răspuns :

1.a)5(2x+3)=7x-21
10x+15=7x-21
3x=-36
x=-12
b) 3(19-x)=4x-13
57-3x=4x-13
x=-70
c)8-4x=2(14+3x)
8-4x=28+6x
-10x=20
x=-2

2.a) 12+4(4x-3)=6(3x-1)
12+16x-12=18x-6
-2x=-6
x=3
b) 5(2x-3)=4(3x+7)-13
10x-15=12x+28-13
-2x=30
x=-15
c)6(5-3x)=20-5(4+3x)
30-18x=20-20-15x
-3x=-30
x=10