10+10a+10+9+11=202a+20a

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Simplifying both sides of the equation, we get:

10 + 10a + 10 + 9 + 11 = 30 + 20a

Combining like terms on the left side, we get:

40 + 10a = 30 + 20a

Subtracting 10a from both sides of the equation:

40 = 30 + 10a

Subtracting 30 from both sides of the equation:

10 = 10a

Dividing by 10:

a = 1

Therefore, the value of a that satisfies the equation is 1.