Question

(2xa+2)*3:4:7=18. ;. ((2*a+178)*15+90):45=630

Answer 1

(2·a+2)·3:4=18 · 7 = 126
(2·a+2)·3 = 126 · 4 = 504
(2·a+2) = 504 : 3 = 168
2·a+2=168
2··a = 168 - 2 =1 66
a = 166:2 = 83

((2·a+178)·15+90):45=630
((2·a+178)·15+90) = 630 · 45 = 28350
(2·a+178)·15+90 = 28350
(2·a+178)·15 = 28350 - 90
(2·a+178)·15 = 28260
2·a+178 = 28260 : 15 =1884
2·a = 1884 - 178 = 1706
a= 1706 : 2 = 853

Answer 2

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