1)
5x+9x=-56
14x=-56
x=-4
2)-9x+8x=2-15
-x=-13
x=13
3)9y-10y=5-7
-y=-2
y=2
4)4y+8y=-7-17
12y=-24
y=-2
5)-12x+11x=15+10
-x=15
x=-15
6)7x-9x=-32
-2x=-32x
x=16
7)-8x+12x=45-25
4x=20
x=5
4y-5y=20-15
-y=5
y=5
56-9х=5х
56=5х+9х
56=14х
х=56÷14
х=4
15-8х=2-9х
15-2=8х-9х
13=-х
х=-13
10у+7=9у+5
10у-9у=5-7
у=-2
17-8у=4у-7
17+7=4у+8у
24=12у
у=2
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Answers & Comments
1)
5x+9x=-56
14x=-56
x=-4
2)-9x+8x=2-15
-x=-13
x=13
3)9y-10y=5-7
-y=-2
y=2
4)4y+8y=-7-17
12y=-24
y=-2
5)-12x+11x=15+10
-x=15
x=-15
6)7x-9x=-32
-2x=-32x
x=16
7)-8x+12x=45-25
4x=20
x=5
4y-5y=20-15
-y=5
y=5
56-9х=5х
56=5х+9х
56=14х
х=56÷14
х=4
15-8х=2-9х
15-2=8х-9х
13=-х
х=-13
10у+7=9у+5
10у-9у=5-7
у=-2
17-8у=4у-7
17+7=4у+8у
24=12у
у=2