exam Maths Puzzle Numerical Ability

I need help working out these equations. My teacher made these problems up.
-8+t/3=7

4(x+3)=20

4y+3
_____ =9
7

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exam Other Question

Write the scale without units.

32. 1 mm : 92 cm

Any help with this equation would be Greatly</b> appreciated.No answers from Solver 91311 please:) Name the property of real numbers illutstrated below. Be specific w/ the naming. Include "of addition" or of" multiplication if needed.
8*(4*9)= (8*4)*9