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1-((1/2)*(3-x)) = 2*(7-x)+3 // - 2*(7-x)+3
1-((1/2)*(3-x))-(2*(7-x))-3 = 0
(-1/2)*(3-x)-2*(7-x)-3+1 = 0
1-1/2*(3-x)-2*(7-x)-3 = 0
1-1/2*(3-x)-2*(7-x)-3 = 0
5/2*x-31/2-3+1 = 0
5/2*x-37/2+1 = 0
5/2*x-35/2 = 0
5/2*x-35/2 = 0
5/2*x-35/2 = 0 // + 35/2
5/2*x = 35/2 // : 5/2
x = 35/2/5/2
x = 7
x = 7
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