1)7/12n-3=1/2n+0.7 2)6 (х-1)=18

[latex] \frac{7}{12}n - 3 = \frac{1}{2}n + 0.7[/latex] [latex] \frac{7}{12}n - \frac{1}{2}n= 0.7+3 [/latex] [latex] \frac{7}{12}n - \frac{6}{12}n = 3.7[/latex] [latex] \frac{1}{12}n=3.7 [/latex] [latex]n= \frac{37*12}{10} [/latex] [latex]n= \frac{222}{5} [/latex] [latex]n= 44.4[/latex]