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(1/2)*(5*x+7) = 4*x+10 // - 4*x+10
(1/2)*(5*x+7)-(4*x)-10 = 0
(1/2)*(5*x+7)-4*x-10 = 0
1/2*(5*x+7)-4*x-10 = 0
1/2*(5*x+7)-4*x-10 = 0
7/2-3/2*x-10 = 0
-3/2*x-13/2 = 0
-3/2*x-13/2 = 0
-3/2*x-13/2 = 0 // + 13/2
-3/2*x = 13/2 // : -3/2
x = 13/2/(-3/2)
x = -13/3
x = -13/3
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