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(2*(5-x))/3 = 7*x // - 7*x
(2*(5-x))/3-(7*x) = 0
(2*(5-x))/3-7*x = 0
(2*(5-x))/3+(-7*3*x)/3 = 0
2*(5-x)-7*3*x = 0
10-23*x = 0
(10-23*x)/3 = 0
(10-23*x)/3 = 0 // * 3
10-23*x = 0
10-23*x = 0 // - 10
-23*x = -10 // : -23
x = -10/(-23)
x = 10/23
x = 10/23
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