1]
[tex]3(2x+5)-4x=15+2x\\\\6x+15-4x=15+2x\\\\6x-4x-2x=15-15\\\\0=0[/tex]
Equation has got infinitely many solutions.
2]
[tex]2x+3=6x-5\\\\2x-6x=-5-3\\\\-4x=-8 \ \ /:(-4)\\\\x=2[/tex]
3]
[tex]3(y-4)=2(y-2)+y\\\\3y-12=2y-4+y\\\\3y-2y-y=-4+12\\\\0=8[/tex]
Equation hasn't got any solution.
4]
[tex]-3(2x+4)=2x-34\\\\-6x-12=2x-34\\\\-6x-2x=-34+12\\\\-8x=-22 \ \ /:(-8)\\\\x=2,875[/tex]
5]
[tex]5x+6x-21=23\\\\5x+6x=23+21\\\\11x=44 \ \ /:11\\\\x=4[/tex]
6]
[tex]-6c+15=-3(2c-5)\\\\-6c+15=-6c+15\\\\-6c+6c=15-15\\\\0=0[/tex]
Equation has got infinitely many solutions.
7]
[tex]5(2x+3)-7x=75\\\\10x+15-7x=75\\\\10x-7x=75-15\\\\3x=60 \ \ /:3\\\\x=20[/tex]
