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x in (-oo:+oo)
(1/3)*((4/5)*x+7) = (7/15)*x+18 // - (7/15)*x+18
(1/3)*((4/5)*x+7)-((7/15)*x)-18 = 0
(1/3)*((4/5)*x+7)+(-7/15)*x-18 = 0
1/3*(4/5*x+7)+(-7*x)/15-18 = 0
(1/3*15*(4/5*x+7))/15+(-7*x)/15+(-18*15)/15 = 0
1/3*15*(4/5*x+7)-7*x-18*15 = 0
35-3*x-270 = 0
-3*x-235 = 0
(-3*x-235)/15 = 0
(-3*x-235)/15 = 0 // * 15
-3*x-235 = 0
-3*x-235 = 0 // + 235
-3*x = 235 // : -3
x = 235/(-3)
x = -235/3
x = -235/3
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