Szczegółowe wyjaśnienie:
7)
[tex]-s +4-3(7-2s)=0\\-s+4-21+6s=0\\5s -17=0\\5s=17/:5\\s = \frac{17}{5}[/tex]
8)
[tex]4+2(-l+3)-l=5\\4-2l+6-l=5\\10-3l=5\\5=3l /:3\\l = \frac{5}{3}[/tex]
9)
[tex]-5+3(-x-2)+4x=8\\-5-3x-6+4x=8\\x-11=8\\x=19[/tex]
10)
[tex]7+4t-2(3+2t)=-4\\7+4t-6-4t=-4\\1 = -4\\sprzecznosc[/tex]
11)
[tex]3(2b+3)-2b+3=-2\\6b+9-2b+3=-2\\4b+12=-2\\4b = -14/:4\\b=-\frac{14}{4} = -\frac{7}{2}[/tex]
12)
[tex]-5(2-3n)-8n+1=5\\-10+15n-8n+1=5\\-9+7n=5\\7n=14/:7\\n=2[/tex]
