150+150+a+a=474

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Solution for 150+150+a+a=474 equation: 



150+150+a+a=474

We move all terms to the left:

150+150+a+a-(474)=0

We add all the numbers together, and all the variables

2a-174=0

We move all terms containing a to the left, all other terms to the right

2a=174

a=174/2

a=87

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