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4*(90-x) = (2/3)*(180-x) // - (2/3)*(180-x)
4*(90-x)-((2/3)*(180-x)) = 0
4*(90-x)+(-2/3)*(180-x) = 0
4*(90-x)-2/3*(180-x) = 0
4*(90-x)-2/3*(180-x) = 0
240-10/3*x = 0
240-10/3*x = 0
240-10/3*x = 0 // - 240
-10/3*x = -240 // : -10/3
x = -240/(-10/3)
x = 72
x = 72
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