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(4/3)*(7-x) = x // - x
(4/3)*(7-x)-x = 0
4/3*(7-x)-x = 0
4/3*(7-x)-x = 0
28/3-7/3*x = 0
28/3-7/3*x = 0
28/3-7/3*x = 0 // - 28/3
-7/3*x = -28/3 // : -7/3
x = -28/3/(-7/3)
x = 4
x = 4
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