Question

Gente me ajuda nessas equações por favor 7 (x-1)-2(x-5)=x-5 --> 2(3-x)=3(x-4)+15 -------> 3(5-x)-3(1-2x)=42

Answer 1

7x-7-2x+10=x-5
7x-2x-x=-5+7-10
4x=-8
x=-8/4
x=-2

Answer 2

7x-7-2x+10=x-5
7x-2x-x=-5+7-10
4x=-8
x=-8/4
x=-2

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2(3-x)=3(x-4)+15

6-2x=3x-12+15

6+12-15=3x+2x

5x=3

x = 5/3
 ou 
x = 1,666...7

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3(5-x)-3(1-2x)=42

15-3x-3+6x=42

-3x+6x = 42-15+3

3x = 30

x= 30/3

x = 10