résoudre l'équation: ((x+7)/5)-3X4= x (x/5) - 3 X 4 + 7 = x (x-3X4+7)/5 = x

((x+7)/5)-3*4=x
((x+7)/5)-12=x
(x/5)+(7/5)-12=x
(7/5)-(60/5)=x-(x/5)
(-53/5)=(5x/5)-(x/5)
(-53/5)=(4x/5)
x=(-53*5)/(4*5)
x=(-53/4)

(x/5)-3*4+7=x
(x/5)-12+7=x
(-5)=x-(x/5)
(-5)=(5x/5)-(x/5)
(-5)=(4x/5)
x=(-5*5)/4
x=(-25/4)

(x-3*4+7)/5=x
(x-12+7)/5=x
(x-5)/5=x
(x/5)-(5/5)=x
(x/5)-1=x
(-1)=x-(x/5)
(-1)=(5x/5)-(x/5)
(-1)=(4x/5)
x=(-1*5)/4
x=(-5/4)