1)9a²b²-12y⁴ = 3(3a²b²-4y⁴)
2)20x³y²+4x²y = 4x²y(5xy+1)
3)7a²bc+14abc = 7abc(a+2)
4)9xyz²-12xy²z = 3xyz(3z-4y)
2x-2y+3x=4
<span>2x=0,5+3y</span>
5x-2y=4
x=0,25+1,5y
5*(0,25+1.5y)-2y=4
у=0.5
x=0,5+3*0,5
х=1