Question 784565
1) {{{-4 + 5z - 16 = 20}}} --> {{{5z=20+4+16}}} --> {{{5z=40}}} --> {{{z=40/5}}} --> {{{highlight(z=8)}}}
 
2) {{{(2/25)* 50z + 640 = 20z}}} --> {{{(2*50/25)z+ 640 = 20z}}} --> {{{4z+ 640 = 20z}}} --> {{{640 = 20z-4z}}} --> {{{640 = 16z}}} --> {{{640/16 = z}}} --> {{{highlight(z=40)}}}
3) {{{M = (2/7)G + 64}}}
If {{{M=-22}}} ,
{{{-22=(2/7)G + 64}}} --> {{{-22-64=(2/7)G}}} --> {{{-86=(2/7)G}}} --> {{{-86*7=7(2/7)G}}} --> {{{-86*7=2G}}} --> {{{G=-86*7/2}}} --> {{{highlight(G=-301)}}}
If {{{M=88}}} ,
{{{88=(2/7)G + 64}}} --> {{{88-64=(2/7)G}}} --> {{{24=(2/7)G}}} --> {{{24*7=2G}}} --> {{{G=24*7/2}}} --> {{{highlight(G=84)}}}