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(-3/4)*x+1/2 = 7*x-91/4 // - 7*x-91/4
(-3/4)*x-(7*x)+1/2-(-91/4) = 0
(-3/4)*x-7*x+1/2+91/4 = 0
93/4-31/4*x = 0 // - 93/4
-31/4*x = -93/4 // : -31/4
x = -93/4/(-31/4)
x = 3
x = 3
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