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(4*(7-x))/3 = -x // + x
(4*(7-x))/3+x = 0
(4*(7-x))/3+(3*x)/3 = 0
4*(7-x)+3*x = 0
28-x = 0
(28-x)/3 = 0
(28-x)/3 = 0 // * 3
28-x = 0
28-x = 0 // - 28
-x = -28 // * -1
x = 28
x = 28
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