How many solutions does this equation have? -4 + 19 - 7f = -15 - 7f
no solution
one solution
infinitely many solutions

No solution

Explanation:

-4+19-7f = -15-7

cancel terms on both sides ( add 7f on both sides)

Calculate the sum

-4+19= -15

-4+19=15

15 = -15

The statement 15 = -15 is false so there is no solution :)

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