A) 113*5+X=300*2
565+X=600
X=600-565
X=35
B) (X-1)/10+90=134*5
(X-1)/10+60=670
(X-1)/10=670-60
(X-1)/10=610
X-1=610*10
X-1=6100
X=6100+1
X=6101
C) 40/2+800/5=X/3-40*2
20+160=X/3-80
180+80=X/3
260=X/3
X=260*3
X=780
D)642-32*X=30*30-118*3
642-32*X=900-354
642-32*X=546
32*X=642-546
32*X=96
X=96/32
X=3