Question

Responda as equações de 1 grau
2x+7=18

10x-9=21+2x+3x

3x-2x+10=10 +5x -40

10-(8x-2)=5x+2(-4x+1)

10x-5(1+x)=3(2x-2)

Answer 1

2x+7=18
2x=18-7
2x=11
x=11÷2
x=5,5

10x-9=21+2x+3x
10x-9=21+5x
10x-5x=21+9
5x=30
x=30÷5
x=6

3x-2x+10=10+5x-40
1x+10=5x-40+10
1x-5x=-40+10-10
-4x=-40
x=-40÷(-4)
x=10

10-(8x-2)=5x+2(-4x+1)
10-8x+2=5x-8x+2
-8x+2+10=-3x+2
-8x+3x=2-2-10
-5x=-10
x=-10÷-5
x=2

10x-5-5x=6x-6-20
10x-5x-5=6x-6-20
5x-5=6x-26
5x-6x=-26-5
-1x=-21
x=-21÷-1
x=21