Step by step:
A:
2x+8=-3.5x+19
2x+3.5x=19-8
5.5x=11
x=2
B:
9(x-2)=7x+5
9x-18=7x+5
9x-7x=5+18
2x=23
x=11.5
C:
3(3x+2)-2x=7x+6
9x+6-2x=7x+6
7x+6=7x+6
No solution
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