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
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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
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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
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4)
6(7х-11)-13(х-6)=14(2х+1)
42x-66-13x+78=28x+14
42x-13x-28x=14+66-78
x=2