(х+104) *2=3х-70

Let's solve the equation step by step:

\[ (х + 104) \cdot 2 = 3x - 70 \]

First, distribute the 2 on the left side:

\[ 2x + 208 = 3x - 70 \]

Next, isolate the variable \(x\). Start by getting all terms containing \(x\) on one side and constant terms on the other side. Subtract \(2x\) from both sides:

\[ 208 = 3x - 2x - 70 \]

This simplifies to:

\[ 208 = x - 70 \]

Next, add 70 to both sides to isolate \(x\):

\[ 208 + 70 = x \]

\[ x = 278 \]

So, the solution is:

\[ \boxed{278} \]