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x in (-oo:+oo)
(1/7)*(49-(14*x)) = (-1/6)*(12*x-42) // - (-1/6)*(12*x-42)
(1/7)*(49-(14*x))-((-1/6)*(12*x-42)) = 0
(1/7)*(49-14*x)+(1/6)*(12*x-42) = 0
1/7*(49-14*x)+1/6*(12*x-42) = 0
1/7*(49-14*x)+1/6*(12*x-42) = 0
0 = 0
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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