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(13/5)*x-((3/4)*x)-(37/10)+21/5 = 0
(13/5)*x+(-3/4)*x-37/10+21/5 = 0
37/20*x+1/2 = 0 // - 1/2
37/20*x = -1/2 // : 37/20
x = -1/2/37/20
x = -10/37
x = -10/37
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