0.3(7)+x=0.6(4+x)

Solution for 0.3(7)+x=0.6(4+x) equation:

0.3(7)+x=0.6(4+x)

We simplify the equation to the form, which is simple to understand 
0.3(7)+x=0.6(4+x)

Reorder the terms in parentheses
+(+2.1)+x=0.6*(4+x)

Remove unnecessary parentheses
+2.1+x=0.6+*(+4+x+)

Reorder the terms in parentheses
+2.1+x=+(+2.4 + 0.6x)

Remove unnecessary parentheses
+2.1+x=+2.4 + 0.6x

We move all terms containing x to the left and all other terms to the right. 
+1x-0.6x=+2.4-2.1

We simplify left and right side of the equation. 
 + 0.4x=0.3

We divide both sides of the equation by 0.4 to get x. 
x=0.75