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2x+2x-x=5+6-5
3x=6
x=2
B. -2-x+3=7x-7-2x
-2+3+7=x+7x-2x
8=6x
x=4/3 No me coincide con tu solución. Mira si esta bien copiada
C. 7-x+9=3x-2-9x
9x-3x-x=-7-2-9
5x=-18
x=-18/5
D. 5x+7+x=5+2x+5
5x+x-2x=-7+5+5
4x=3
x=3/4
E. 4x+6+x=5+9x+9
4x+x-9x=-6+5+9
-4x=8
x=-2
F. 4+6x+3= -4x-7+x (sol.x= -14/9)
6x+4x-x=-4-3-7
9x=-14
x=-14/9