book Maths Puzzle Numerical Ability

Word Problem
Two angles of a triangle measure 21 degrees and 86 degrees. What is the measure of the third angle?

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book Other Question

solve the equation
logbase3(3x-2)=2

I have absolutely no Idea what to do..can someone Please help me.
Thanks how do I solve, everything in the parenthesis is raised to the -4th power

(-7a^2b^3c^0)^-4
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( 3a^3b^4c^3)