2(10-7)-2(1+10r)=-r+2r

Solution for 2(10-7)-2(1+10r)=-r+2r equation:

2(10-7)-2(1+10r)=-r+2r

We simplify the equation to the form, which is simple to understand 
2(10-7)-2(1+10r)=-r+2r

Reorder the terms in parentheses
+(+6)-2*(1+10r)=-r+2r

Remove unnecessary parentheses
+6-2+*(+1+10r+)=-r+2r

Reorder the terms in parentheses
+6+(-2-20r)=-r+2r

Remove unnecessary parentheses
+6-2-20r=-r+2r

We move all terms containing r to the left and all other terms to the right. 
-20r+1r-2r=-6+2

We simplify left and right side of the equation. 
-21r=-4

We divide both sides of the equation by -21 to get r. 
r=0.19047619047619