Primer grado
100

x-4=6+2

12

200

2x+2=9-3-2x

x=1

300

3x+5-2=2x-7+12

x=2

400

x-12+7=x-5x-1

x)=4/5

500

-2x-4-6+x=5x-2x-4

x=-3/2