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(1/4)*(x+7)+(1/2)*(4*x+8) = 0
1/4*(x+7)+1/2*(4*x+8) = 0
1/4*(x+7)+1/2*(4*x+8) = 0
9/4*x+23/4 = 0
9/4*x+23/4 = 0
9/4*x+23/4 = 0 // - 23/4
9/4*x = -23/4 // : 9/4
x = -23/4/9/4
x = -23/9
x = -23/9
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