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(1/4)*(x-3)+(3*x)/2 = 15 // - 15
(1/4)*(x-3)+(3*x)/2-15 = 0
1/4*(x-3)+(3*x)/2-15 = 0
(1/4*2*(x-3))/2+(3*x)/2+(-15*2)/2 = 0
1/4*2*(x-3)+3*x-15*2 = 0
7/2*x-30-3/2 = 0
7/2*x-63/2 = 0
(7/2*x-63/2)/2 = 0
(7/2*x-63/2)/2 = 0 // * 2
7/2*x-63/2 = 0
7/2*x-63/2 = 0 // + 63/2
7/2*x = 63/2 // : 7/2
x = 63/2/7/2
x = 9
x = 9
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