{4x+10y=2 {7x+15y=-3
4x +10y = 2
7x +15y = -3
28x +70y = 14
28x +60y = -12
28x -28x +70y -60y = 14 -(-12)
10y = 26
y = 13/5
4x + 10y = 2
4x = 2 - (13/5)*10
4x = 2 - 26
4x = -24
x = -6
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4x +10y = 2
7x +15y = -3
28x +70y = 14
28x +60y = -12
28x -28x +70y -60y = 14 -(-12)
10y = 26
y = 13/5
4x + 10y = 2
4x = 2 - (13/5)*10
4x = 2 - 26
4x = -24
x = -6