a, (x+0.75)x3.2=205.8
x+0.75=64.3125
x=63.5625
b, X x 2.5-3.46=4.68
X x 2.5=8.14
X = 3.256
a)(x+0,75)x(4-0,8)=205,8
(x+0,75)x3,2=205,8
x+0,75=205,8:3,2
x+0,75=64,3125
x=64,3125-0,75
x=63,5625
b)X x 2,5 -3,46=4,68
X x 2,5 = 4,68 + 3,46
X x 2,5 = 8,14
x = 8,14 :2,5
x = 3,256