Question

calcular o valor de x de modo que; 2x+3=15 ,7x-1=13,2x-4=3 ,4x=2=-18 ,5x-2=7+6 , 10x +1=-4-5

Answer 1

2x+3=15
2x=15-3
2x=12
x = 12/2 ----> X=6

7x-1=13
7x=13+1
7x=14
x=14/7 ----> X=2

2x-4=3
2x=3+4
2x=7
x=7/2 termina aqui

5x-2=7+6
5x=7+6+2
5x=15
x=15/5 -----> X=3

10x+1= -4 -5
10x=-4-5-1
10x=-10
x= -10/10 -----> X= -1