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(1/6)*(2*x-140) = 5*x // - 5*x
(1/6)*(2*x-140)-(5*x) = 0
(1/6)*(2*x-140)-5*x = 0
1/6*(2*x-140)-5*x = 0
1/6*(2*x-140)-5*x = 0
-14/3*x-70/3 = 0
-14/3*x-70/3 = 0
-14/3*x-70/3 = 0 // + 70/3
-14/3*x = 70/3 // : -14/3
x = 70/3/(-14/3)
x = -5
x = -5
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