What is the solution to 4x 10 3x 40-3x?

It has no solution and if you mean 4x+10+3x+40-3x then it can be simplified to: 50+4x

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Assuming that the equation is 4x+10+3x+40-3x = 0,

then it will reduces to 4x = - 50,

then the answer is:

x = -12.5