Question

RESOLVA AS EQUAÇÕES DO 1° GRAU, X+30=40 , 30-20+2X=10, 3X-10+13=-2X+28 , 20X-30=40+30-20 , -5X+45-89=-90+41 , 10X-20=40+50, 3-2(X+3)=X-18 ,

Answer 1

x+30=40
x=40-30
x=10

30-20+2x=10
10+2x=10
2x=10-10
x=0

3x-10+13=-2x+28
3x+3=-2x+28
3x+2x=28-3
5x=25
x=5

20x-30=40+30-20
20x=50+30
20x=80
x=4

5x+45-89=-90+41
5x-44=-19
5x=-19+44
5x=25
x=5

10x-20=40+50
10x-20=90
10x=90+20
10x=110
x=11

3-2(x+3)=x-18
3-2x-6=x-18
-3-2x=x-18
-3+18=x+2x
15=3x
5=x