-6=-9(7+x)+4x
-6=-42-9х+4х
-6=-42-5х
5х=-36
х=-7,2
Ответ. х=-7,
2-х+4(7-х)=-7х+5 -х+28-4х = -7х+5
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-6=-9(7+x)+4x
-6=-42-9х+4х
-6=-42-5х
5х=-36
х=-7,2
Ответ. х=-7,
2-х+4(7-х)=-7х+5 -х+28-4х = -7х+5
-х-4х+7х = 5-282х=-23
х=-23/2
х=-11,5
-5x - x + 5(x-5) = -(-5-x)-4
-5x - x + 5x - 25 = 5x + x - 4
-7x = -4 + 25
-7x = 21
x = -3
Как то так))