Physics/Maths
posted by charlie .
Keplers third law I understand.
T^2/a^3 of one planet = T^2/a^3 second planet.
But I can't do the algebra to solve for the second planet's a^3 (semimajor axis)
Would someone walk me through the steps please? Thanks.

a2^3= (T2/t1)^2 * a1^3
where a2 is the semimajor axis of the second planet. 
Thanks
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