<span>9*(x-5)+4*(6-x)=3+3*(x+20)-2*x
9*x-45+24-4*x=3+3*x+60-2*x
7*x=63+45-24
7*x=84
x=12</span>
7 км2 = 7<span>000000м2
1 600 дм2 = 16м2
240 000 см2 = 24м2
28 500 дм2 = 285м2</span>
85*5*(у-3)=3*(8у-9)
425*(у-3)=24у-27
425у-1275=24у-27
425у-24у=-27+1275
401у=1248
у=1248/401
у=3,112
Например: 14, 28, 42,56,70, 84, и так далее