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x in (-oo:+oo)
4*(90-x) = (2/3)*x // - (2/3)*x
4*(90-x)-((2/3)*x) = 0
4*(90-x)+(-2/3)*x = 0
4*(90-x)+(-2*x)/3 = 0
(3*4*(90-x))/3+(-2*x)/3 = 0
3*4*(90-x)-2*x = 0
1080-14*x = 0
(1080-14*x)/3 = 0
(1080-14*x)/3 = 0 // * 3
1080-14*x = 0
1080-14*x = 0 // - 1080
-14*x = -1080 // : -14
x = -1080/(-14)
x = 540/7
x = 540/7
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