5(2x-8)+15=-15
distribute 5 into (2x-8)
5(2x)+5(-8)+15=-15
10x+(-40)+15=-15
simplify
10x+(-25)=-15
add 25 on both sides to get 20x alone
10x+(-25)+25=-15+25
10x=-10
divide 10 on both sides to get x alone
10x/10=-10/10
x=-1
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