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3a+7(a-b)=2
5a-4b=7
3a+7a-7b=2
5a-4b=7 /x(-2)
10a-7b=2
-10a+8b=-14
10a-7b=2
b=-12
b=-12
10a (- 7 x -12)=2
b=-12
10a=-82/ :10
b=-12
a=-8,2