Explicación paso a paso:
21-6x=27-8x
-6x+8x=27-21
2x=6
x=6/2
x=3
16x-1=65x-36
-1+36=65x-16x
35=49x
x=7/5
3x+5=5x-13
+5+13=5x-3x
18=2x
18/2=x
9=x
35-5x=31-x
35-31=-x+5x
4=4x
4/4=x
1=x
8-12x=-2x-27
-12x+2x=-27-8
-10x=-35
x=7/2
6x-6=6x+18
6x-6x=+18+6
x=24
7x+15=9x-21
+15+21=9x-7x
36=2x
36/2=x
18=x
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Explicación paso a paso:
21-6x=27-8x
-6x+8x=27-21
2x=6
x=6/2
x=3
16x-1=65x-36
-1+36=65x-16x
35=49x
x=7/5
3x+5=5x-13
+5+13=5x-3x
18=2x
18/2=x
9=x
35-5x=31-x
35-31=-x+5x
4=4x
4/4=x
1=x
8-12x=-2x-27
-12x+2x=-27-8
-10x=-35
x=7/2
6x-6=6x+18
6x-6x=+18+6
x=24
7x+15=9x-21
+15+21=9x-7x
36=2x
36/2=x
18=x