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4x - 2y =10| .3 | 12x - 6y = 30
-------------------- -
10y = -6
y = -6/10 => -3/5
3x+y = 6
3x -3/5 = 6
3x =6 + 5/3
3x = 33/5
x = 33/5 x 1/3
x = 11/5