5x+3x+21=-9

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Solution for 5x+3x+21=-9 equation:



5x+3x+21=-9
We move all terms to the left:
5x+3x+21-(-9)=0
We add all the numbers together, and all the variables
8x+30=0
We move all terms containing x to the left, all other terms to the right
8x=-30
x=-30/8
x=-3+3/4

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