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-15a+4+16=50
We simplify the equation to the form, which is simple to understand
-15a+4+16=50
We move all terms containing a to the left and all other terms to the right.
-15a=+50-4-16
We simplify left and right side of the equation.
-15a=+30
We divide both sides of the equation by -15 to get a.
a=-2
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