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a) 4x+27supra8x+45=7supra13
b)6x+7supra5x+21=7supra8


Răspuns :

4x+27/8x+45=7/13
13(4x+27)=7(8x+45)
52x+351=56x+315
52x-56x=351-315
-4x=-36
x=9



6x+7/5x+21=7/8
8(6x+7)=7(5x+21)
48x+56=45x+147
48x-45x=147-56
13x=91
x=7


Succes:)