7(3-5s)-2(2s-4)=-127

Solution for 7(3-5s)-2(2s-4)=-127 equation:

7(3-5s)-2(2s-4)=-127

We simplify the equation to the form, which is simple to understand 
7(3-5s)-2(2s-4)=-127

Reorder the terms in parentheses
+(+21-35s)-2*(2s-4)=-127

Remove unnecessary parentheses
+21-35s-2+*(+2s-4+)=-127

Reorder the terms in parentheses
+21-35s+(-4s+8)=-127

Remove unnecessary parentheses
+21-35s-4s+8=-127

We move all terms containing s to the left and all other terms to the right. 
-35s-4s=-127-21-8

We simplify left and right side of the equation. 
-39s=-156

We divide both sides of the equation by -39 to get s. 
s=4