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7c - 3 = 6c + 5
7b - 7 = 2b + 13
2a - 3 = a- a + 1
4b + 3 = 3b -4
7+ 3c = ( - 5 ) + 2c
5 d + 2 = 3d.
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7c-3=6c+5 /-6c
c-3=5 /+3
c=8
7b-7 = 2b+13 /-2b
5b-7=13 /+7
5b=20 /:5
b=4
2a-3=a+1 /-a
a-3=1 /+3
a=4
4b + 3 =3b - 4 /-3b
b+3=-4 /-3
b=-7
7+3c = (-5) + 2c /+5
12+3c =2c /-3c
12=(-c )
-12=c
5d+2=3d /-5d
2=(-2d)
2= (-d)
-2=d