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MelaniaCristina
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rezolva ecuatia:[2(5x-7)+19]:3-14=21

Răspuns :

Fabi2005
[2(5x-7)+19]:3-14=21 /+14
[2(5x-7)+19]:3=35 /*3
2(5x-7)+19=105 /-19
2*(5x-7)=98 /:2
5x-7=49 /+7
5x=56 /5 
x=8
Aurelcraciun59
[2*(5x-7)+19]:3-14=21
[2*(5x-7)+19]:3=21+14
[2*(5x-7)+19]:3=35
[2*(5x-7)+19]=35x3
2*(5x-7)+19=105
2*(5x-7)=105-19
2*(5x-7)=86
5x-7=86:2
5x-7=43
5x=43+7
5x=50
x=50:5
x=10

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