Solve for a
a = \frac{127}{4} = 31\frac{3}{4} = 31.75
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252=25\times 5+a\times 4
Multiply 36 and 7 to get 252.
252=125+a\times 4
Multiply 25 and 5 to get 125.
125+a\times 4=252
Swap sides so that all variable terms are on the left hand side.
a\times 4=252-125
Subtract 125 from both sides.
a\times 4=127
Subtract 125 from 252 to get 127.
a=\frac{127}{4}
Divide both sides by 4.
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