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(4*(x+7))/2 = (7*(x-4))/3 // - (7*(x-4))/3
(4*(x+7))/2-((7*(x-4))/3) = 0
(4*(x+7))/2+(-7/3)*(x-4) = 0
(4*(x+7))/2-7/3*(x-4) = 0
(4*(x+7))/2+(-7/3*2*(x-4))/2 = 0
4*(x+7)-7/3*2*(x-4) = 0
140/3-2/3*x = 0
(140/3-2/3*x)/2 = 0
(140/3-2/3*x)/2 = 0 // * 2
140/3-2/3*x = 0
140/3-2/3*x = 0 // - 140/3
-2/3*x = -140/3 // : -2/3
x = -140/3/(-2/3)
x = 70
x = 70
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