0.7w-0.5w+0.3w=-4

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Solution for 0.7w-0.5w+0.3w=-4 equation: 



0.7w-0.5w+0.3w=-4

We move all terms to the left:

0.7w-0.5w+0.3w-(-4)=0

We add all the numbers together, and all the variables

0.5w+4=0

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

0.5w=-4

w=-4/0.5

w=-8

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