solve this equation: 15(x-9)-2(x-12)+5(x+6)
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15(x-9)-2(x-12)+5(x+6)=0
(15x-135)-(2x-24)+(5x+30)=0
15x-135-2x+24+5x+30=0
15x-2x+5x-135+24+30=0
18x-81=0
18x=81
x=4.5
(15x-135)-(2x-24)+(5x+30)=0
15x-135-2x+24+5x+30=0
15x-2x+5x-135+24+30=0
18x-81=0
18x=81
x=4.5
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