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2x-6=3x-36+x
2x-6=4x-36
30=2x
15=x
8) 7x-12-12x=-x+12
-12-5x=-x+12
-24=4x
-6=x
9) -14+3x=4x+21+4x
-14+3x=8x+21
-35=5x
-7=x
10) -8x-10+2x=5x-3x+6
-6x-10=2x+6
-16=8x
-2=x
11) x-8x-4+7=18+3x+5
-7x+3=23+3x
-20=10x
-2=x
12) -7x+11+4x-8=-18
-3x+3=-18
21=3x
7=x
Espero haberte ayudado y BUENA SUERTE