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7x+2y=1
2y=-3-3x
7x+2y=1
2y=-3-3x
7x+(-3-3x)=1
2y=-3-3x
7x-3-3x=1
2y=-3-3x
7x-3x=1+3
2y=-3-3x
4x=4 /:4
2y=-3-3x
x=1
x=1
2y=-3-3
x=1
2y=-6 /:2
x=1
y=-3
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2x-3y=7
4x+1/2y=1
2x=7+3y /*2
4x+1/2y=1
4x=14+6y
14+6y+1/2y=1
4x=14+6y
6y+1/2y=1-14
4x=14+6y
6,5y=-13 /:6,5
4x=14+6y
y=-2
4x=14+6*(-2)
y=-2
y=-2
4x=2 /:4
y=-2
x=1/2
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