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15x-15=-7-2x
15x+2x=-7+15
17x=8
x=8/17
2) (21-7x):7=(x+4)+(5x-2)
21-7x=7x+28+35x-14
-7x-7x-35x=28-14-21
-49x=-7
x=-7/-49
x=1/7
espero te sirva