3(x+14)+4(x+28)=-21

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Solution for 3(x+14)+4(x+28)=-21 equation: 



3(x+14)+4(x+28)=-21

We move all terms to the left:

3(x+14)+4(x+28)-(-21)=0

We add all the numbers together, and all the variables

3(x+14)+4(x+28)+21=0

We multiply parentheses

3x+4x+42+112+21=0

We add all the numbers together, and all the variables

7x+175=0

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

7x=-175

x=-175/7

x=-25

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