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a) 3x+a=2x+1, a
a = 2x+1-3x
a = 1-x
b) 2(x+m)=m-4x+5, m
2x+2m = m-4x+5 /-m -2x
m = -6x+5
c) -x+a+b=2a-3b-2x /-a -b
-x = a-4b-2x /+2x
x = a-4b
d) x-3(n+2x)=4n+2x
x-3n-6x = 4n+2x
-3n-5x = 4n+2x /-2x +3n
-7x = 7n /:(-7)
x = -n