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- -------- = -------- => -13*42=x*7 => 7x= - 546 => x= - 546/7 => x= - 78
7 42
-30 15
------- = ----- => -30*x= 15*(-12) => -30x= -180 => x=180/30 => x=6
-12 x
-1 2
---- = ------ => -1*10=2*x => 2x= -10 => x= -5
x 10