1.{3/4 (r-2s)=6
{1//2 (r+2s)=0

2. {2p+11q=5
{7p-3q=-24

3.{9m+6n=-12
{4m-5n=10

4.{3a+5b=-8
{5a-3b=32

5.{4x+5y=-21
{7x-2y=17

Obs.: Preciso dos cálculos.
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