Need a little

what is the missing term that makes these ratios equivalent?
1.5: 3, 31.5:

a² + b²= c²

24² + 7² = c²

c= 25

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answer: 193

explanation:

200-7 = 193

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116