Question

1, 3, 5

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Answer 1

1. (134 + x) - 583 = 426

134 + x = 426+583

134 + x = 1009

x = 1009 - 134

x = 875

3. (x - 506) + 215 = 429

x - 506 = 429 - 21

x - 506 = 407

x = 407 + 506

x = 913

5. (942 - a) - 126 = 254

942 - a = 254 + 126

942 - a = 380

a = 942 - 380

a = 562

Answer 2

1) 134+х=426+583
134+х=1009
х=1009-134
х=875
3) х-506=429-215
х-506=215
х=215+506
х=721
5) 942-a=254+126
942-a=380
a=380+942
a=1322