-2z-xy=x+7 for x

i don't understand any of the questions on the homework. I didn't understand the lesson at all. i need an answer to this question and how it was done? please? thank you(:
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1 Answer

-xy -x =2z+7 . . . -x(y+1)=2z+7 . . . -x=(2z+7)/(y+1) . . . x=-(2z+7) / (y+1)
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