2. х - (-64 2/3) = - 51 1/3
х - 64 2/3 = - 51 1/3
х = - 51 1/3 + 64 2/3
х = 13 1/3
4. х - (-4 5/12) = 55 7/12
х - 4 5/12 = - 55 7/12
х = - 55 7/12 + 4 5/12
х = - 51 2/12 = 51 1/6
7x+41x=192
48x=192
x=192/48
x=4
40x-4x=540
36x=540
x=540/36
x=15
(9x+7x)*6=288
16x*6=288
96x=288
x=288/96
x=3