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Հանրահաշիվ

4x+3y=6                                                

2x+y=4                                                  

y=4-2x

4x+3(4-2x)=6

4x+12-6x=6

12-6=-4x+6x

6=2x

x=3

y=4-6

y=-2

2x+5y=25

4x+3y=15

2x=25-5y

2(25-5y)+3y=15

50-10y+3y=15

10y-3y=50-15

7y=35

y=5

2x=25-25

2x=0

x=0

4x+3y=-5

6x+5y=-7

4x=-5-3y

x=(-5-3y)/4

-6(5+3y)/4+5y=-7

(-30-18y)/4+5y=-7

-7.5-4.5y+5y=-7

0.5y=0.5

y=1

x=-8/4

x=-2

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