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(1/2)*x-1.4 = 7/4 // - 7/4
(1/2)*x-(7/4)-1.4 = 0
(1/2)*x-7/4-1.4 = 0
1/2*x-3.15 = 0 // + 3.15
1/2*x = 3.15 // : 1/2
x = 3.15/1/2
x = 6.3
x = 6.3
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