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x in (-oo:+oo)
(-9/2)*x = (3/8)*(7-(4*x)) // - (3/8)*(7-(4*x))
(-9/2)*x-((3/8)*(7-(4*x))) = 0
(-3/8)*(7-4*x)+(-9/2)*x = 0
(-9*x)/2-3/8*(7-4*x) = 0
(-3/8*2*(7-4*x))/2+(-9*x)/2 = 0
-3/8*2*(7-4*x)-9*x = 0
-6*x-21/4 = 0
(-6*x-21/4)/2 = 0
(-6*x-21/4)/2 = 0 // * 2
-6*x-21/4 = 0
-6*x-21/4 = 0 // + 21/4
-6*x = 21/4 // : -6
x = 21/4/(-6)
x = -7/8
x = -7/8
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