-(-х) - 3ц.5/16 = -5ц.3/8
х=-5ц.3/8 + 3ц.5/16
х=-(5ц.6/16 - 3ц.5/16)
х= - 2ц.1/16
Ответ: -2ц.1/16
2) (-4ц.7/16 - х)+3ц.7/20 = -1ц.7/40
-4ц.7/16-х=-1ц.7/40-3ц.7/20
-х=-(1ц.7/40+3ц.14/40) + 4ц.7/16
-х=-4ц.21/40+4ц.7/16
-х = -4ц.42/80+4ц.35/80
-х=-(4ц.42/80-4ц.35/80)
х=7/80
Ответ: 7/80