Question

the sum of four times a number and seven is ten

Answer 1

10=4n+7
-7        -7

3=4n
divide by four

0.75=n

Answer 2

The unknown number is = 3/4

Let the unknown number be X

4(X)  +  7 =  10

Minus 7 from the both sides:

4x  +7  -7 =  10 -7

4x + 0 = 3

4x = 3

Make x the subject of formula by dividing both sides by 4,

4x/4 = 3/4

Therefore,

x= 3/4

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