7(7+x)+3(4+x)=21

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Solution for 7(7+x)+3(4+x)=21 equation: 



7(7+x)+3(4+x)=21

We move all terms to the left:

7(7+x)+3(4+x)-(21)=0

We add all the numbers together, and all the variables

7(x+7)+3(x+4)-21=0

We multiply parentheses

7x+3x+49+12-21=0

We add all the numbers together, and all the variables

10x+40=0

We move all terms containing x to the left, all other terms to the right

10x=-40

x=-40/10

x=-4

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