17 (2-x) + 5(x+12)= 8
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(1-7x) (7x-1)
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17 (2-x)+5 (x+12)=8
34-17x+5x+60=8
-12x+94=8
12x=94-8
12x=86
x=86/12=43/6
next,
(1-7x)(7x-1)
7x-1-49x^2+7x
-49x^2+14x-1
If we put it equal to zero
-49x^2+14x-1=0
49x^2-14x+1=0
49x^2-7x-7x+1=0
7x (7x-1)-1 (7x-1)=0
(7x-1)(7x-1)=0
x=1/7
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