solve 15(y-4)-2(y-9)+5(y+6)=0
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15 ( y - 4 ) - 2( y - 9 ) + 5 (y + 6 ) = 0
15×y - 15×4 -2×y + 2×9 + 5×y + 5×6 = 0
15y - 60 - 2y + 18 + 5y + 30 =0
(15y + 5y ) - 2y + (18 + 30 ) - 60 = 0
20y - 2y + 48 - 60 = 0
18y - 12 = 0
18 y = 12
y = 12 / 18
y = 6 / 9
y = 2 / 3
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therefore,【answer : y = 2/3 】
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15×y - 15×4 -2×y + 2×9 + 5×y + 5×6 = 0
15y - 60 - 2y + 18 + 5y + 30 =0
(15y + 5y ) - 2y + (18 + 30 ) - 60 = 0
20y - 2y + 48 - 60 = 0
18y - 12 = 0
18 y = 12
y = 12 / 18
y = 6 / 9
y = 2 / 3
________________________
therefore,【answer : y = 2/3 】
________________________
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