x+3(x)=21

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Solution for x+3(x)=21 equation:


x+3(x)=21

We simplify the equation to the form, which is simple to understand 
x+3(x)=21

Reorder the terms in parentheses
x+(+3x)=21

Remove unnecessary parentheses
+x+3x=+21

We move all terms containing x to the left and all other terms to the right. 
+1x+3x=+21

We simplify left and right side of the equation. 
+4x=+21

We divide both sides of the equation by 4 to get x. 
x=5.25

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