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substitute the value of x which is 3 :10/ (2-x)+4 = -10+4= -6
It is an algebraic expression.
5x - 4x = 13 - 3 ie x = 10
If: x+7-4x+1 = -10 Then: 8-3x = -10 And: -3x = -10-8 => -3x = -18 So: x = -18/-3 => x = 6
There is an infinite number of solutions because x is not determined.