Question

ME AJUDEMMM PLSSS

a)3×+1=2×

b) 5+×=-7+8×=

c)3(×+1)+2=5+2(×-1)=

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Answer 1

a) x=-1

b) x= 12/7

c) x= -2

Answer 2

Resposta:

A)x= -1

B)x= 12/7

C)x= -2

Explicação passo-a-passo:

A)3x+1=2x

3x+1=2x

3x+1-2x=0

3x-2x=-1

3x-2x

(3-2)x

x

3x-2x=1

x= -1

resposta

x= -1

B)5+x=-7+8x

5+x=-7+8x

5+x

x+5

5+x=-7+8x

x+5=-7+8x

-7+8x

8x-7

x+5=-7+8x

x+5=8x-7

x+5-8x=-7

x-8x=-7-5

x-8x

(1-8)x

-7x

x-8x=-7-5

-7x=-7-5

-7-5

-(7+5)

-12

-7=-7-5

-7x=-12

-1×(-7)x=-1×(-12)

7x=-1×(12)

7x=1×12

7x=12

-7x=-12

7x=12

7x÷7=12÷7

x=12÷7

x= 12/7

7x=12

x= 12/7

resposta

x= 12/7

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

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

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

3x+3+2=5+2x-2

3+2

5

3x+3+2=5+2x-2

3x+5=5×2x-2

5-2

3

3x+5=5+2x-2

3x+5=3+2x

3+2x

2x+3

3x+5=3+2x

3x+5=2x+3

3x+5-2x=3

3x-2x=3-5

3x-2x

(3-2)x

x

3x-2x=3-5

x=3-5

-2

x=3-5

x= -2

resposta

x= -2