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(3*(7*x+15))/7 = (6*x+1)/(-2) // - (6*x+1)/(-2)
(3*(7*x+15))/7-((6*x+1)/(-2)) = 0
(3*(7*x+15))/7+(-1*(6*x+1))/(-2) = 0
(-2*3*(7*x+15))/(-2*7)+(-1*7*(6*x+1))/(-2*7) = 0
-2*3*(7*x+15)-1*7*(6*x+1) = 0
-84*x-97 = 0
(-84*x-97)/(-2*7) = 0
(-84*x-97)/(-2*7) = 0 // * -2*7
-84*x-97 = 0
-84*x-97 = 0 // + 97
-84*x = 97 // : -84
x = 97/(-84)
x = -97/84
x = -97/84
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