Answer
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$10/3*x+4y=-4$
$5x+6y=-6$
$10/3*x+4y=-4$
$3*(10/3*x+4y=-4)$
$10x +12y=-12$
$5x+6y=-6$
$10x +12y=-12$
$-2*(5x +6y=-6)$
$10x +12y=-12$
$-10x -12y=12$
$10x +12y=-12$
$-10x -12y+(10x +12y)=12+(-12)$
$10x-10x+12y-12y=12-12$
$0=0$