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(1/5)*(x+4) = 8*x-(18*(1-x))-7 // - 8*x-(18*(1-x))-7
(1/5)*(x+4)+18*(1-x)-(8*x)+7 = 0
(1/5)*(x+4)+18*(1-x)-8*x+7 = 0
1/5*(x+4)+18*(1-x)-8*x+7 = 0
1/5*(x+4)+18*(1-x)-8*x+7 = 0
7-89/5*x-8*x+94/5 = 0
7-129/5*x+94/5 = 0
129/5-129/5*x = 0
129/5-129/5*x = 0
129/5-129/5*x = 0 // - 129/5
-129/5*x = -129/5 // : -129/5
x = -129/5/(-129/5)
x = 1
x = 1
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