Решите уравнения: 1)5(3-2у)-4(9-у)=3(у+5) 2)14(2х-3)-5(х+4)=2(3х+5)+5х 3)9(3х-7)+3(8х-11)=3(9х+8) 4)6(7х-11)-13(х-6)=14(2х+1)

1) 5(3-2у)-4(9-у)=3(у+5) 15-10y-36+4y=3y+15 -10y+4y-3y=15-15+36 -9y=36 y=36:(-9) y=-4 ========== 2) 14(2х-3)-5(х+4)=2(3х+5)+5х 28x-42-5x-20=6x+10+5x 28x-5x-6x-5x=10+42+20 12x=72 x=72:12 x=6 ========= 3) 9(3х-7)+3(8х-11)=3(9х+8) 27x-63+24x-33=27x+24 27x+24x-27x=24+63+33 24x=120 x=120:24 x=5 ============ 4) 6(7х-11)-13(х-6)=14(2х+1) 42x-66-13x+78=28x+14 42x-13x-28x=14+66-78 x=2