equation a resoudre help me 4/5(x-1)=12(x+7) 5x+1/6=3x-3/8 x-7/5+2x=2+x+2/4

Bonjour.

4/5(x - 1) = 12(x + 7)
4x/5 - 4/5 = 12x + 84
4x/5 - 12x = 4/5 + 84
4x/5 - 60x/5 = 4/5 + 420/5
- 56x/5 = 424/5
- 56x = 424
x = - 424/56
x = - 53/7.

5x + 1/6 = 3x - 3/8
5x - 3x = - 3/8 - 1/6
2x = - 9/24 - 4/24
2x = - 13/24
x = - 13/24 : 2
x = - 13/24 * 1/2
x = - 13/48.

x - 7/5 + 2x = 2 + x + 2/4
3x - 7/5 = x + 2 + 1/2
3x - x = 7/5 + 2 + 1/2
2x = 14/10 + 20/10 + 5/10
2x = 39/10
x = 39/10 : 2
x = 39/10 * 1/2
x = 39/20

Bonne journee !

(4/5)x-4/5=12x+84
(-4/5)-84=12x-(4/5)x
(-4/5)-(420/5)=(60/5)x-(4/5)x
(-424/5)=(56/5)x
(-424)=56x
x=(-424/56)
x=(-8*53)/(8*7)
x=(-53/7)

5x+1/6=3x-3/8
5x-3x=(-1/6)-3/8
2x=(-8/48)-(18/48)
2x=(-26/48)
2x=(-2*13)/(24*2)
2x=(-13/24)
x=(-13/48)

x-7/5+2x=2+x+2/4
x+2x-x=7/5+2+2/4
2x=7/5+10/5+1/2
2x=17/5+1/2
2x=34/10+5/10
2x=39/10
x=39/20