Question

-equação do 1 grau com uma incognita : a) 3x+3=x-13 b)5x+7=2x+28 c)3x-7=15+x d)7x+10=-15-8x e)3x+15=10+4x f)2(x-1)+3=x+15 g) 3x+7=22+x h) 2-3(x-1)=-5+x i )10-2(3-x)=1-3(1-x)

Answer 1

a) 3x+3 = x-13 
3x -x = -13 -3
2x = -10
x = -10/2 = -5

b) 5x+7=2x+28
5x -2x = 28 - 7
3x = 21
x = 21/3
x = 7

c) 3x-7=15+x
3x - x = 15 + 7
2x = 22
x = 22/2 = 11

d) 7x+10=-15-8x
7x+8x = -15-25
15x = -40
x = -40/15 = -8/3

e) 3x+15=10+4x
3x-4x = 10-15
-x = -5 
x= 5

f) 2(x-1)+3 = x+15
2x-2+3 = x+15
x = 15 +2 - 3
x = 14

g) 3x+7=22+x
2x = 22-7
x = 15/2

h) 2-3(x-1) = -5+x
2 -3x +3 = -5 +x
-4x = -5 -2 -3 
x = -10/-4 = -5/2

i) 10-2(3-x) = 1- 3(1-x)
10-6+2x = 1 -3 +3x
10 - 6 -1 +3 = 3x -2x
6 = x