Question

Ajutați-mă toate 4 Ecuații ! Va rog

Answer 1

1)3x+2(5x+4)=34
3x+10x+8=34
13x+8=34 /-8
13x=26
x=2

2)(7x-3x)÷2=6
4x÷2=6 /×2
4x=12 /÷4
x=3

3)5(x+1)+2(x+1)=42
5x+5+2x+2=42
7x+7=42 /-7
7×=35 /÷7
x=5

4)36÷(2x+2)=45÷15
36×15=45(2x+2)
540=90x+90
-90x=90-540
-90x=-450
x=5