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(-3)*a-(-5)=-4
We move all terms to the left:
(-3)*a-(-5)-(-4)=0
We add all the numbers together, and all the variables
(-3)*a+9=0
We multiply parentheses
-3a+9=0
We move all terms containing a to the left, all other terms to the right
-3a=-9
a=-9/-3
a=+3
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