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4-x = (2*(x+7))/3 // - (2*(x+7))/3
4-((2*(x+7))/3)-x = 0
(-2/3)*(x+7)-x+4 = 0
4-2/3*(x+7)-x = 0
4-2/3*(x+7)-x = 0
4-5/3*x-14/3 = 0
-5/3*x-2/3 = 0
-5/3*x-2/3 = 0
-5/3*x-2/3 = 0 // + 2/3
-5/3*x = 2/3 // : -5/3
x = 2/3/(-5/3)
x = -2/5
x = -2/5
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