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(4-(5*x))/2 = 7 // - 7
(4-(5*x))/2-7 = 0
(4-5*x)/2-7 = 0
(4-5*x)/2+(-7*2)/2 = 0
4-5*x-7*2 = 0
-5*x-10 = 0
(-5*x-10)/2 = 0
(-5*x-10)/2 = 0 // * 2
-5*x-10 = 0
-5*x-10 = 0 // + 10
-5*x = 10 // : -5
x = 10/(-5)
x = -2
x = -2
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