-3(3x+15)-(10+x)=35
Clear the parentheses.
-9x-45 -10-x=35
combine terms.
-10x-55=35
add 55 to both sides.
-10x-55+55=35+55
-10x=90
multiply by -1
10x=-90
divide both sides by 10
10x/10 = -90/10
x=-9
-3(3x+15)-(10+x)=35
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