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70 = 2 α / :2
35 = β
β = 35
b) (2a x 7) :2 = 28 / x2
2a x 7 = 56
14a = 56 / : 14
a = 4
c) 2α + α = 180
3α = 180 / :3
α = 60
d) 210+2β+4β = 360
210 + 6β = 360 / -210
6β = 150 / : 6
β = 25