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(-1/2)*(4*x-5) = 3*x-x-10 // - 3*x-x-10
(-1/2)*(4*x-5)-(3*x)+x+10 = 0
(-1/2)*(4*x-5)-3*x+x+10 = 0
x-1/2*(4*x-5)-3*x+10 = 0
x-1/2*(4*x-5)-3*x+10 = 0
x-5*x+5/2+10 = 0
5/2-4*x+10 = 0
25/2-4*x = 0
25/2-4*x = 0
25/2-4*x = 0 // - 25/2
-4*x = -25/2 // : -4
x = -25/2/(-4)
x = 25/8
x = 25/8
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