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(-6/7)*(6*x+4) = (1/28)*x-15 // - (1/28)*x-15
(-6/7)*(6*x+4)-((1/28)*x)+15 = 0
(-6/7)*(6*x+4)+(-1/28)*x+15 = 0
15-6/7*(6*x+4)-x/28 = 0
(-6/7*28*(6*x+4))/28-x/28+(15*28)/28 = 0
15*28-6/7*28*(6*x+4)-x = 0
420-145*x-96 = 0
324-145*x = 0
(324-145*x)/28 = 0
(324-145*x)/28 = 0 // * 28
324-145*x = 0
324-145*x = 0 // - 324
-145*x = -324 // : -145
x = -324/(-145)
x = 324/145
x = 324/145
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