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(X-3)+4+(X+8)=74

We move all terms to the left:

(X-3)+4+(X+8)-(74)=0

We add all the numbers together, and all the variables

(X-3)+(X+8)-70=0

We get rid of parentheses

X+X-3+8-70=0

We add all the numbers together, and all the variables

2X-65=0

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

2X=65

X=65/2

X=32+1/2

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