Question

gente me ajuda a montar essa equação do 1° grau

Answer 1

9+1-11+12-7+x=900
x=900-9-1+11-12-7
x=891-1+11-12-7
x=890+11-12-7
x=901-12-7
x=899-7
x=882

100-200+300+x=400-500
x= 400-500 -100+200-300
x=-100 -100+200-300
x= -200+200-300
x=-300

5x+x=54
6x=54
x=54/6
x=9

97- 107+x+3=80
x=80-97+107-3
x=-17+107-3
x=90-3
x=87

+2-3+1+x+9=20
x=20-2+3-1-9
x=18+3-1-9
x=21-1-9
x=20-9
x=11

100x=600-300
100x=300
x=300/100
x=3

Espero ter ajudado!