Respuesta :

VanillaCoco

Answer:

a= 40

Step-by-step explanation:

-5a + 7.5a - 25 = 53.2 + 21.8​

add like terms on both sides: 2.5a - 25 = 75

add 25 on both sides: 2.5a = 100

divide both sides by 2.5: a = 40

Mathboy234

Answer:

a = 40

Step-by-step explanation:

-5a + 15/2a - 25 = 53.2 + 21.8​: Add 25 to Isolate variable

-5a + 15/2a = 53.2 + 21.8 + 25: Combine Like Terms and create simmilar terms

-10/2a + 15/2a = 100: CLM again

5/2a = 100: multiply both sides by inverse of 5/2 to isolate variable

a = 40

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