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Step-by-step explanation:
2× (4x-5y) = 21
3x+10y= -53
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8x-10y = 42
3x+10y=-53
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11x= -11
{x=-1}
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3x+10y=-53
x=-1
3(-1)+10y=-53
-3+10y=-53
10y= -50
{y=5}