a)236+m=352
m=352-236
m=116
n + 145 = 280
n = 280 - 145
n=135
b)420 - a = 342
420 - 342 = a
a=78
b - 98 = 124
b = 124 + 98
b = 222
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m = 352 - 236
m = 116
spr.
L = 236 + 116 = 352 = P
n + 145 = 280
n = 280 - 145
n = 135
spr.
L = 135 + 145 =280 = P
420 - a = 342
- a = 342 - 420
- a = - 78
a = 78
spr.
L = 420 - 78 = 342 = P
b - 98 = 124
b = 124 + 98
b = 222
spr.
L = 222 - 98 = 124 = P
a)236+m=352
m=352-236
m=116
n + 145 = 280
n = 280 - 145
n=135
b)420 - a = 342
420 - 342 = a
a=78
b - 98 = 124
b = 124 + 98
b = 222