Answer:
see below
Explanation:
a. 1+3x = 3x + 1 --> infinite, it's the same thing
b. 4x + 1 = 3x + 2 --> x=1 one solution
c. 5x + 1 = 5x - 2 --> no solution. it's not possible
d. -3(x+1)=-3x+3 --> x=-1, one solution
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