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x=12-35
x=-23
b)9x+71=8x+95
9x-8x=-71+95
x=24
c)x+7=5
-----
3
x+7=15
----- ---
3 3
x=15-7
x=8
d)5x+2=x-8
--------
3
5x+2=3x-24
------- -------
3 3
5x-3x=-24-2
2x=-26
x=-26
----
2
x=-13