Question

Buna dau multe puncte daca rezolvati corect va rog mult
3*(2x-1)+7=5*(x-1)+7
3,1*(1-3x)+x=0.4*(x-14)
0.8(0.5-2x)=2x+0.4
0.2(x-3)-1=0.5(x+3)-0.4
-5(x-7)=30-(2x+1)
-2(x+5)+3=2-3(x+1)

Answer 1

1)3*(2x-1)+7 = 5*(x-1)+7
6x-3+7 = 5x-5+7
6x+4 = 5x+2
6x-5x=2-4
x = -2
2)3,1*(1-3x)+x=0,4*(x-14)
3,1-9,3x+x=0,4x-5,6
-8,3x-0,4x = -3,1-5,6
-8,7x = 8,7
x = -1
3)0,8(0,5-2x)=2x+0,4
0,4-1,6x = 2x+0,4
2x-1,6x=0,4-0,4
0,4x=1
x=2,5
4)0,2(x-3)-1=0,5(x+3)-0,4
0,2x - 0,6 - 1 = 0,5x - 1,5 - 0,4
0,2x - 1,6 = 0,5x - 1,9
0,2x-0,5x = 1,6 - 1,9
-0,3x = -0,3
x = 1
5)-5(x-7)=30-(2x+1)
-5x + 35 = 30 - 2x - 1
-5x + 35 = 29 - 2x
2x - 5x = 29 - 35
-3x = -6
x = 2
6)-2(x + 5) + 3= 2-3(x + 1)
-2x - 10 + 3=2 - 3x - 3
-2x - 7 = -1 - 3x
-2x + 3x = 7 - 1
x = 6

Answer 2

3(2x+1)+7=5(x+1)+7=
6x+3+7=5x+5+7=
6x+10=5x+12=
6x-5x=12-10⇒
x=2

b)3.1(1-3x)+x=0.4(x-14)=
3.1-9.3x+x=0.4x-5.6⇒
-8.3x+3.1=0.4x-5.6⇒
-8.3x-0.4x=-.3.1-5.6⇒
7.9x=-8.7⇒x=8.7/7.9

c)0.8(0.5-2x)=2x+0.4=
0.4-1.6x=2x+0.4⇒
-1.6x-2x=-0.4+0.4⇒
-3.6x=0⇒x=0

d)-5(x-7)=30-(2x+1)=
-5x+35=30-2x-1⇒
-5x+2x=30-35-1⇒
-3x=-6⇒x=-6/-3⇒x=2

e)-2(x+5)+3=2-3(x+1)=
-2x-10+3=2-3x-3⇒-2x+3x=7-1⇒x=6
sucees