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4*x-((3/10)*m) = (1/5)*m // - (1/5)*m
4*x-((3/10)*m)-((1/5)*m) = 0
(-3/10)*m+(-1/5)*m+4*x = 0
4*x-1/2*m = 0 // + -1/2*m
4*x = -(-1/2*m) // : 4
x = (-(-1/2*m))/4
x = 1/8*m
x = 1/8*m
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