5) 16(6x-3y)=3(4x+5y)
96x-48y=12x+15y
96x-12x=15y+48y
84x=63y
x/63=y/84=k
x=63
y=84
5*63+6*84/10*63-3*84
=315+504/630-252
=819/378
=273/126
=91/42
6)
a)14x-7-66+6x=3x+12
14x+6x-3x=12+66+7
17x=85
x=5
b)x²+4x+4+2(x²-25)=3(x²-2x+1)+1
x²+4x+4+2x²-50=3x²-6x+3+1
4x+6x=1+3+50-4
10x=50
x=5
c)4(2x-3)+6(3x-2)=3(4x+3)-5
8x-12+18x-12=12x+9-5
8x+18x-12x=-5+9+12+12
14x=28
x=2
d)
15(x+2)-2x-4-3x/5=3(7x-x-3/2)
15x+30-2x-4-3x/5=21x-3x-9/2
150x+30-20x-4+3x=210x-3x+9
150x-20x+3x-210x=-3+4-30
-77x=-29
x=29/77
