4-7х/15+1-х/3=4-2х+1/5
( 4 - 7X) + 5*(1 - X) = 15 * 4 - 3 * (2X + 1 ) 4 - 7X + 5 - 5X = 60 - 6X - 3 - 12X + 9 = - 6X + 57 -6X + 12X = 9 - 57 6X = - 48 X = ( - 8 )
4-7×/15+1-?/3=4-2×1/5=????,