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7x+4 /5 - x=3x-5/2 /*10
2(7x+4)-10x=5(3x-5)
14x+8-10x=15x-25
4x-15x=-25-8
-11x=-33 /:(-11)
x=3
B.
9-7x/3 +1 ≤ x -1-x/2 /*6
2(9-7x)+6 ≤ 6x - 3(1-x)
18-14x+6 ≤ 6x- 3-3x
-14x-3x ≤ -24-3
-17x ≤ -27 /:(-17)
x ≥ 1¹⁰/₁₇