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-3x-3x+9+-4=2-13x-9
2-6x+5=2-13x-9
7x=-14
x=-2
b) =7
=7/*2
3x+3=14
3x=11
x=3
c) 4+3x-12=6-2x+6
-8+3x=12-2x
5x=20
x=4