1.
{a+b=-40
{a-b=-160
2a=-200
a=-100
{a=-100
{-100+b=-40
{b=60
2.
{a-b=-4
{a+b=32
2a=28
a=14
{a=14
{14+b=32
{b=18
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1.
{a+b=-40
{a-b=-160
2a=-200
a=-100
{a=-100
{-100+b=-40
{a=-100
{b=60
2.
{a-b=-4
{a+b=32
2a=28
a=14
{a=14
{14+b=32
{a=14
{b=18