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(7*x+6)/42+(5*x+2)/28 = 5*x+3/10 // - 5*x+3/10
(7*x+6)/42+(5*x+2)/28-(5*x)-(3/10) = 0
(7*x+6)/42+(5*x+2)/28-5*x-3/10 = 0
(10*28*(7*x+6))/(10*28*42)+(10*42*(5*x+2))/(10*28*42)+(-5*10*28*42*x)/(10*28*42)+(-3*28*42)/(10*28*42) = 0
10*28*(7*x+6)+10*42*(5*x+2)-5*10*28*42*x-3*28*42 = 0
4060*x-58800*x-3528+2520 = 0
2520-54740*x-3528 = 0
-54740*x-1008 = 0
(-54740*x-1008)/(10*28*42) = 0
(-54740*x-1008)/(10*28*42) = 0 // * 10*28*42
-54740*x-1008 = 0
-54740*x-1008 = 0 // + 1008
-54740*x = 1008 // : -54740
x = 1008/(-54740)
x = -36/1955
x = -36/1955
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