Răspuns :
a×7/10=a-36
7a/10=a-36
10×(a-36)=7a
10a-360=7a
10a-7a=360
3a=360
a=360:3
a=120
7a/10=a-36
10×(a-36)=7a
10a-360=7a
10a-7a=360
3a=360
a=360:3
a=120
X × 7/10 = X - 36
7X/10 = (10X - 360)/10
7X = 10X - 360
7X - 10X = -360
-3X = -360
X = 360/3
X = 120
7X/10 = (10X - 360)/10
7X = 10X - 360
7X - 10X = -360
-3X = -360
X = 360/3
X = 120