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{x-5=6 / * -2
{2x+3y=7
{-2x+10y=12
b) {1/2x-4y=3,4
{x+y=8 / * -1/2
{1/2x-4=3,4
{ -1/2x-1/2y=4
c) {2.6x+5y=10
{1,3x-2y=-3 / *-2
{2,6x+5y=10
{-2.6x+4y=6
Chyba o takie coś ci chodziło :0 a jeśli tak to mam nadzieje że pomogłam :)