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(1/2)*x+(3/5)*x-1/2 = -137/10 // + -137/10
(1/2)*x+(3/5)*x-1/2-(-137/10) = 0
(1/2)*x+(3/5)*x-1/2+137/10 = 0
11/10*x+66/5 = 0 // - 66/5
11/10*x = -66/5 // : 11/10
x = -66/5/11/10
x = -12
x = -12
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