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-4(x-5)=15x+10

We move all terms to the left:

-4(x-5)-(15x+10)=0

We multiply parentheses

-4x-(15x+10)+20=0

We get rid of parentheses

-4x-15x-10+20=0

We add all the numbers together, and all the variables

-19x+10=0

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

-19x=-10

x=-10/-19

x=10/19

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