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-15x+21+5x=-19.
We move all terms to the left:
-15x+21+5x-(-19.)=0
We add all the numbers together, and all the variables
-15x+5x+21-(-19)=0
We add all the numbers together, and all the variables
-10x+40=0
We move all terms containing x to the left, all other terms to the right
-10x=-40
x=-40/-10
x=+4
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