1/2a-10b=c solve for a

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1/2a-10b=c solve for a

Multiply each side of the equation by 2:
2/2a - 2(10)b = 2c

Simplify:
a - 20b = 2c

Add 20b to each side:
a - 20b + 20b = 2c + 20b

Cancel the 20b on the left side:
a = 2c + 20b

You can also factor out a 2 on the left side for another version of this answer:
a = 2(c + 10b)