Question: how to plot this ?

Hey there . i am new to this software.. so please help me to plot this: i have two equations: x1+x2=m -3*x1 + 4*x1^3 - 3*x2 + 4*x2^3 = 0 i want to have m on the y-axis . Range for m is 0.4..1 i want to have the curves of both x1 and x2 on x- axis and on the same graph . Both x1 and x2 have a range of 0..1. thanks in advance ..
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