To eliminate the y-terms and solve for x in the fewest steps,

label Algebra
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Jun 27th, 2015

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since 9*(5x-4y) = 9*28 

45x-36y = 252

-4*(3x-9y)=-120 

-12x+36y =120

add the two we have 33x = 372 

x = 372/33 

the last answer is correct 

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Jun 27th, 2015

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