a) -2x+18=6x
-2x-6x = -18
-8x = -18
-x = -18/8
-x = -9/4 *(-1)
x= 9/4
b) 4x-30=11x
4x-11x=+30
-6x=30
-x= 30/6
-x=5 *(-1)
x=-5
c)2x+10=3x
2x-3x=-10
-x= -10 *(-1)
x=10
Resposta:
A) -2x + 18 = 6x
6x + 2x = 18
8x = 18
X = 18 ÷ 8
X = 2,25
B) 4x – 30 = 11x
11x – 4x = 30
7x = 30
X = 30 ÷ 7
X = 4,28...
C) 2x + 10 = 3x
3x – 2x = 10
x = 10
