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-56=7a-28
-56+28=7a
a=-28/7
a=-4
-4x+2x-7=-x+14+2x-54/9
-2x-7=x+20
-7-20=x+2x
x=-27/3
x=-9
x+3x+5=-3.5
4x=-3.5-5
x=-8.5/4
x=-2.125
Espero que sirva!Saludos!