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1/10-((2*(4-x))/5)-((7*(2*x+1))/15) = 0
(-2/5)*(4-x)+(-7/15)*(2*x+1)+1/10 = 0
1/10-2/5*(4-x)-7/15*(2*x+1) = 0
(-2/5*10*(4-x))/10+(-7/15*10*(2*x+1))/10+1/10 = 0
1-2/5*10*(4-x)-7/15*10*(2*x+1) = 0
1-16/3*x-62/3 = 0
-16/3*x-59/3 = 0
(-16/3*x-59/3)/10 = 0
(-16/3*x-59/3)/10 = 0 // * 10
-16/3*x-59/3 = 0
-16/3*x-59/3 = 0 // + 59/3
-16/3*x = 59/3 // : -16/3
x = 59/3/(-16/3)
x = -59/16
x = -59/16
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