35+23+х=100(30-15)+у=8070-а=8+9+2х+12=50-(15+5)

Question

35+23+х=100
(30-15)+у=80
70-а=8+9+2
х+12=50-(15+5)

Answer 1

35+23+х=100
23+х=100-35
23+х=65
х=65-23
х=42
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(30-15)+у=80
15+у=80
у=80-15
у=65
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70-а=8+9+2
70-а=19
а=70-19
а=51
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х+12=50-(15+5)
х+12=50-20
х+12=30
х=30-12
х=18