1) -6(9-5х)=9x+9; 2) -3(1+4x)=-4x-5; 3) -6(-5-7х)=-8х+2
-6(9-5х)=9x+9
-54+30x=9x+9
30x-9x=9+54
21x=63
x=63:21
x=3
-3(1+4x)=-4x-5
-3-12x=-4x-5
-12x+4x=-5+3
-8x=-2
x= 0.25
-6(-5-7х)=-8х+2
30+42x=-8x+2
42x+8x=2-30
50x=-28
x=- 5.6
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-6(9-5х)=9x+9
-54+30x=9x+9
30x-9x=9+54
21x=63
x=63:21
x=3
-3(1+4x)=-4x-5
-3-12x=-4x-5
-12x+4x=-5+3
-8x=-2
x= 0.25
-6(-5-7х)=-8х+2
30+42x=-8x+2
42x+8x=2-30
50x=-28
x=- 5.6