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x-7-6x-10=3
-5x=3+17
-5x=20 /:(-5)
x=-4
sprawdzenie
(-4-7)-2(3*(-4)+5)=3
-11-2(-12+5)=3
-11-2*(-7)=3
-11+14=3
3=3
x-7-6x-10=3
-5x-17=3 /+17
-5x=20 /÷ (-5)
x=(-4)
spr.
[(-4)-7]-2[3*(-4)+5]=3
(-11)-2(-12+5)=3
-11+24-10=3
3=3